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List of glitches (Generation II): Difference between revisions

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This is a '''list of glitches''' that occur in the [[Generation II]] [[main series]] [[Pokémon games]].
This is a '''list of glitches in the [[Generation II]] [[Pokémon games]]'''. It applies to both the original [[Game Boy Color]] and the [[Nintendo 3DS|3DS]] [[Virtual Console]] releases unless otherwise noted.


==In Pokémon Gold and Silver==
Some glitches are found on a separate page:
===Present glitch===
* [[List of battle glitches (Generation II)]]
{{main|Present (move)#Generation II}}
In Gold and Silver, the move {{m|Present}} is glitched and the Level, Attack, and Defense variables of the damage formula are replaced. This causes the move to deal unusually large or small amounts of damage depending on the Pokémon. This glitch is not present in [[Pokémon Stadium 2]] or {{game|Crystal}}.


===Trainer House glitch===
==Pokémon Gold, Silver, and Crystal==
{{main|Trainer House glitch}}
===Celebi Egg glitch===
This glitch affects the Trainer in the [[Trainer House]]. It is caused by corrupted RAM for save data in {{game|Gold and Silver|s}}. It is not present in {{game|Crystal}}.
{{main|Celebi Egg glitch}}
 
===Day Care experience loss===
In this generation only, when a Pokémon is withdrawn from the {{pkmn|Day Care}}, its [[experience]] is rounded down to the minimum value for the current level. As a result, a Pokémon can lose experience in the Day Care.
 
For instance, a level 99 {{p|Lugia}} or {{p|Ho-Oh}} has a value between 1,212,873 and 1,249,999 experience points; once it obtains a total of 1,250,000 experience points, it will reach level 100. If a Lugia or Ho-Oh is deposited in the Day Care when it has 1,249,999 experience points (needing just 1 more point to reach level 100), but the player immediately withdraws it without walking any steps, then this Pokémon will revert to exactly 1,212,873 experience points (the minimum amount for level 99), losing 37,126 experience points in the process.
 
===Interregional Teleport quirk===
If the player travels to either [[Kanto]] or [[Johto]] in the [[S.S. Aqua]] and then {{m|teleport}}s, they will be taken to either the {{ci|Vermilion}} or {{ci|Olivine}} Pokémon Center as opposed to the last [[Pokémon Center]] they used in either [[region]]. This does not occur with the [[Magnet Train]]. If the player loses a {{pkmn|battle}} during their trip, they will be sent to their cabin instead.
 
{{YouTubeVid|Va3pzlujwE4|channel/UCjt3Dy3gFbW50L0Vl1gZWmA|name=SM|Johto|Kanto}}
 
===Legendary beast cry distortion===
When the player checks {{p|Entei}}'s [[Pokédex]] entry, plays its [[cry]], and then immediately switches to either {{p|Suicune}}'s or {{p|Raikou}}'s entries, their cry will be distorted.
 
When the Pokédex is sorted alphabetically, this glitch can also be applied to [[Espeon (Pokémon)|Espeon]]'s cry.
 
===Pokémon cloning===
{{main|List of cloning glitches#Storage system move method|List of cloning glitches → Storage system move method}}
{{main|List of cloning glitches#Trading method|List of cloning glitches → Trading method}}
 
===S.S. Aqua map glitch===
[[File:S.S. Aqua map.png|thumb|right|Initial state of the Pokégear map on the S.S. Aqua, erroneously showing the player's current place as New Bark Town]]
If the player uses the [[Pokégear]] map while travelling on [[S.S. Aqua]], the ship appears as a small sprite at the bottom-right corner. However, the map cursor erroneously selects [[New Bark Town]] by default as the player's current place.
 
It is not possible to select S.S. Aqua in the map. The feature to select S.S. Aqua in the map is technically programmed in the game, but not actually available to the player.
 
===Strain 0 Pokérus===
{{main|Pokérus#Generation_II|Pokérus → Generation_II}}
[[Pokérus]] strain values of zero can be generated by the Pokérus generation algorithm with probability 15/255. The primary cause is an incorrectly-placed scratch register copy<ref>[https://github.com/pret/pokecrystal/blob/2fe0cbbb19df504723934f39473064033c64ef6f/engine/events/pokerus/pokerus.asm#L54 pret/pokegold: pokerus.asm line 54]</ref> which expresses when the high four bits are zero. In this case, a part of the logic is skipped, and because the bit test cleared the lower four bits and the higher bits are zero, a value of zero is copied to the scratch register, whose low bits become the strain. The day count of one is then derived from this zero as normal.
 
Strain zero in Generation II behaves almost as normal: it is visible in the status screen, it triggers the [[Nurse Joy]] and [[Professor Elm]] dialogues, it spreads as normal, it increases [[stat experience]] gain as normal, and it is cured over time as normal. The lone abnormality is that when strain zero is cured, it does not leave the Pokémon in a post-infection state, but in a state as if it had never been infected, like if traded to a Generation I game: it can catch Pokérus again, does not block Pokérus spread, and does not have increased stat experience gain.
 
===Time Capsule glitches===
====Time Capsule exploit====
{{main|Time Capsule exploit}}
 
The [[Time Capsule exploit]] works around the programming checks put in place on the [[Time Capsule]] to prevent players from trading [[Generation II]] Pokémon to [[Generation I]] games.
 
====Trade evolution learnset====
{{cat|Generation I Pokémon}} that [[trade evolution|evolve by trading]] can be taught [[glitch move]]s. This can be achieved by [[Trade|trading]] such {{OBP|Pokémon|species}} from a Generation I game to a Generation II game at a [[level]] where its [[Evolution|evolved]] form will learn a [[move]] not present in Generation I. Trading the Pokémon back to the Generation I game will cause the move to become a glitch move.
 
For example, trading a level 34 {{p|Graveler}} from {{game3|Red and Blue|Pokémon Red|s}} to {{game3|Gold and Silver|Pokémon Gold|s}} will cause the Graveler to evolve into {{p|Golem}}. Since it is at level 34, it will learn {{m|Rollout}} in Gold. If it is then traded back to Red, it will still have the move but the game won't recognize it properly since it is a {{cat|Generation II moves|Generation II move}}, so it will become {{m|TM05}}.


===Bug-Catching Contest data copy glitch===
===Unown Egg hatching animation===
{{main|Bug-Catching Contest data copy glitch}}
{{incomplete|section|Double-check if Unown forms other than the "A" Unown can be seen in the hatching animation}}
This glitch only appears in the Japanese versions of Gold and Silver, when a player {{m|Fly|flies}} out of the Bug-Catching Contest causing the creation of unstable Pokémon data. The glitch was fixed in Pokémon Crystal and in all international releases of Generation II games.


==In Pokémon Crystal==
In this generation, when an {{p|Unown}} Egg hatches, the hatching animation displays the "A" Unown regardless of the actual Unown form.
====Distorted cry====
{{incomplete|section|checking if it occurs in Gold and Silver}}


If player plays the {{p|Entei}}'s cry in Pokédex and then immediately switches to either {{p|Suicune}} or {{p|Raikou}}, their cry will be distorted.
While it is not possible to obtain an Unown Egg in normal gameplay since this Pokémon is in the {{egg|No Eggs Discovered}} [[Egg Group]], an Unown Egg is obtainable nonetheless by means such as the [[Celebi Egg glitch]].
{{youtubevid|50Cgj1n5g1A|Dukstless|Crystal}}
====Player sprite glitch====
A glitch that can be found in {{game|Crystal}}. This glitch causes an overworld sprite color switch between {{ga|Ethan}} and {{ga|Kris}}. It is caused by creating a save file as one gender of character, then overwriting it with another gender of character, but turning off while it is overwriting. It disappears after saving and resetting the game. Note that the old save file will be overwritten.


{{youtubevid|fcB1LRVhX7E|Zachtheglitchbuster|Crystal}}
==Pokémon Gold and Silver==
===All languages===
====Cerulean Gym====
This bug was carried over from {{game2|Red|Green|Blue}}. In [[Cerulean Gym]], the [[water tile]]s have [[wild Pokémon]] data programmed in, which allows players to [[Fishing|fish]] {{OBP|Pokémon|species}}. It was already corrected in {{game|Yellow}} and it was fixed again in {{game|Crystal}}. This likely happened because while Yellow came out after Red and Blue did, Red and Blue were already being used as the base of Gold and Silver due to Yellow not existing yet.


==In all Generation II games==
====Trainer House====
===Celebi Egg glitch===
{{main|Trainer House glitches}}
{{main|Celebi Egg glitch}}


===Coin Case glitches===
===English language===
====Coin Case glitches====
{{main|Coin Case glitches}}
{{main|Coin Case glitches}}
The Coin Case glitches are a set of glitches which occur exclusively in the English versions of {{game|Gold and Silver|s}}. They allow the player to run arbitrary code by exploiting an oversight in the process used by the game to print the text box data for the [[Coin Case]].
When the game is played on the [[Game Boy]] or [[Super Game Boy]] instead of the [[Game Boy Color]], the effects caused by the oversight are more limited.
===Japanese language===
====Bug-Catching Contest====
{{main|Bug-Catching Contest glitch}}
In the Japanese versions of {{game|Gold and Silver|s}}, if the player uses {{m|Fly}} or {{m|Teleport}} to leave the [[National Park]] during a [[Bug-Catching Contest]], the game will treat the contest as still ongoing.
This may also be used to create unstable {{OBP|Pokémon|species}} data.
{{YouTubeVid|e4D6wJGGqZA|ChickasaurusGL|Bug}}
==Pokémon Crystal==
===All languages===
====Clair gift glitch====
In Crystal, if the player [[black out|whites out]] due to {{status|poison}} damage while still inside the Dragon Shrine at [[Dragon's Den]] after receiving the {{badge|Rising}}, they can return to the [[Blackthorn Gym]] to receive the reward [[TM]] from [[Clair]]. However, due to an oversight, if the player then returns to Dragon's Den and stands on the tile directly in front of the Dragon Shrine's door, Clair will appear again and give the player another {{TM|24|DragonBreath}}, as if they hadn't already received it.
{{YouTubeVid|8BvBjqxmyOk|ChickasaurusGL|Crystal}}
====Pokémon meeting level glitch====
In {{game|Crystal}}, the level and time of day when a Pokémon was originally caught, hatched, or received is stored in the game data and can be verified by visiting the [[Poké Seer]]. However, this only works correctly for Pokémon met up to level 63.
This Pokémon meeting data is condensed into a single byte, the upper two bits represent the time it was met, and the lower six bits represent the level it was met. For example, a level 70 Pokémon met in the morning will be reported as a level 6 Pokémon met in the day by the Poké Seer.
This glitch does not usually affect the gameplay for these reasons:
* In Pokémon Crystal, there are no available Pokémon met over level 60 (other than Pokémon from [[in-game trade]]s). The [[List of wild Pokémon from in-game events#Generation II|in-game event]] {{p|Ho-Oh}} and {{p|Lugia}} are both found at this level, even though they had been available at level 40 or 70 in earlier games.
* Pokémon obtained from [[in-game trade]]s do not record any Pokémon meeting data. Those Pokémon are received with the same level as the player's traded Pokémon, but they are not affected by this glitch.
* The [[Generation I]] games and {{game|Gold and Silver|s}} do not record the meeting data of any Pokémon, therefore the Pokémon caught in those games are not affected by this glitch even if they are transferred to Pokémon Crystal.


===Error codes===
In Pokémon Crystal, any Pokémon obtained with a high enough level from [[event Pokémon|event distributions]] had their meeting data incorrectly recorded because of this glitch. In particular, this affected the level 70 {{DL|List of PCNY event Pokémon distributions (Generation II)|Shiny Mewtwo}} received from [[Pokémon Center New York]].
{{main|Error codes}}
{{YouTubeVid|kcCaESMRl5Y|ChickasaurusGL|Crystal}}


===Exp. Share glitch===
===Languages other than Japanese===
If a Pokémon with the same [[original Trainer]] as the player is sent into battle with an {{DL|Experience-affecting item|Exp. Share}} held, that Pokémon will gain half of the experience twice (with each half being rounded individually), meaning that it doesn't receive 100% of the experience due to it losing the rounded-down experience.
====Legendary beasts incomplete OT check====
===Experience gain glitch===
In Crystal, when the player talks to [[Eusine]] in the [[Celadon City]] Pokémon Center he will report a rumor that {{p|Ho-Oh|a rainbow colored Pokémon}} has appeared in [[Bell Tower|Tin Tower]] (Ho-Oh) and leave the building when {{p|Suicune}}, {{p|Raikou}} or {{p|Entei}} appear in the party and/or storage boxes with OT and ID data matching that of the player. Due to a glitch, the English version of Crystal will only check the first five characters of the player's name. For example, if the player's name was “CRYSTAL”, then having the [[legendary beasts]] with the OT name “CRYST” and a matching ID of the player will enable the event. This is due to the player names in the original Japanese version being a maximum of five characters long and the English version failing to account for the change.
{{incomplete|needs=image or video}}
{{YouTubeVid|GVTTmReM4nQ|ChickasaurusGL|Crystal}}
When Pokémon gains 5-digit amount of experience, the number will be glitched. This is possible only in the [[Trainer House]]. The lowest possible level is 82 for Pokémon with experience yield of 255, and the lowest experience yield with which this is possible with is 208.


===Experience underflow glitch===
===Japanese language===
{{main|Experience#Experience underflow glitch}}
====Pokémon Communication Center====
In Generations I and II, level 1 Pokémon using the "medium-slow" growth algorithm will jump from level 1 to level 100 after gaining a {{tt|low amount|less than 54 if total experience is 0}} of experience points.
In the Japanese version of {{game|Crystal}}, address $A800 in SRAM triggers a script in the [[Pokémon Communication Center]] that may be arbitrarily set to values other than 0x00 when the game does not currently have a [[Save|save file]]; otherwise, its value is correctly set to 0x00. This causes all sort of bugs, like crashes, freezes, and other random behavior.


{{youtubevid|SXH8u0plHrE|TTEchidna|Gold}}
While the purpose of this script is not known, it appears to be related to the [[Mobile System GB]]. In the localizations, although the related code is unused, this issue was fixed by adding a check that looks up the value of address $A800 and automatically resets it to 0x00.<ref>[https://github.com/kanzure/pokecrystal/blob/master/misc/mobile_45.asm#L23968 pokecrystal/mobile_45.asm at master · kanzure/pokecrystal · GitHub]</ref>
{{YouTubeVid|nqEaRpDEeTw|ChickasaurusGL|Crystal}}


===Leveling past 100===
===German language===
In Generation I and II, if a Pokémon is obtained at a level above 100, it can be leveled up with [[Rare Candies]] up to level 255. If a Rare Candy is fed to a level 255 Pokémon, its level will be reset to 0. If a Pokémon above level 100 levels up due to [[experience]], its level will be reset to 100.
====Dude freezing glitch====
On the Virtual Console release of German Crystal, if the player has full boxes while the dude wants to present how to catch Pokémon, the game will [[Game freeze|freeze]]. Other languages of Crystal freeze or reset the game with the 'Game Boy Color only' message in different ways.


===Love Ball glitch===
====Dude money glitch====
The {{DL|Poké Ball|Love Ball}} only gains a catch rate of 8× on Pokémon of the same [[gender]] and species as the player's Pokémon, rather than the opposite gender. This was corrected in {{game|HeartGold and SoulSilver|s}}.
On the German cartridge version of Crystal, when doing the Dude glitch, trying to use the [[Poké Ball]] shows:


===Pokémon Storage System cloning===
{{sign|RBY|header}}
{{main|Cloning glitches#Storage system method}}
{{sign|RBY|Die POKéMON-BOX}}
{{sign|RBY|ist voll. Das}}
{{sign|RBY|kannst du jetzt}}
{{sign|RBY|nicht benutzen.}}
{{sign|RBY|footer}}


===Sketch glitch===
This message also glitches the left side of the screen. Another message is shown:
{{main|Sketch glitch}}


===Thick Club glitch===
{{sign|RBY|header}}
If a {{p|Marowak}} with a maximum {{stat|Attack}} stat (maximum {{IV}}s and [[effort values|Stat Exp]] in Attack) uses {{m|Swords Dance}} while holding a [[Thick Club]], its Attack will overflow to 8. This glitch is not present in [[Pokémon Stadium 2]].
{{sign|RBY|KUMPEL hebt}}
{{sign|RBY|{{PDollar}}{{tt|######|This value varies}} auf!}}
{{sign|RBY|footer}}


===Trade cloning===
If the tutorial is accepted again, the player is left with {{PDollar}}999999.
{{main|Cloning glitches#Trading method}}
{{YouTubeVid|A8zaTOkjKS4|ChickasaurusGL|Crystal}}


===Transform assumption glitch===
==Pokémon Stadium 2==
In Generation {{gen|I}} and {{gen|II}}, any Pokémon that uses {{m|Transform}} is regarded as a {{p|Ditto}} in its new form; this means that if the player catches a {{p|Mew}} or a [[glitch Pokémon]] which has used the move Transform, or a Pokémon which has used Transform via {{m|Mirror Move}}, instead they will obtain a Ditto. Mew turning into Ditto was not an issue, because wild Mew could not have been be legitimately encountered. This system was later changed in Generation III, where wild Mew could be encountered.
===All languages===
====Depositing a held Key Item====
If a Pokémon is holding a Key Item in the Generation II (such as by using the [[Celebi Egg glitch]]), this item can be deposited normally in the Metal Case from the {{OBP|PC|Stadium}} in Pokémon Stadium 2 and then transferred to another Generation II game.


===Park Ball scrambled graphics glitch===
For instance, this can be used to transfer a [[Squirt Bottle]] between Generation II games for the purpose of [[sequence breaking]].
If the {{player}} cheats to obtain a {{DL|Poké Ball|Sport Ball|Park Ball}} in the Ball pocket of their [[Bag]] and uses it to capture a {{pkmn2|wild}} {{OBP|Pokémon|species}}, the game will fail to reload the graphics correctly, causing a temporary glitch in which part of both the Bag and {{pkmn|battle}} screens are visible together until the Park Ball's graphics are cleared.


==Glitches involving communication with the Generation I games==
====Infinite continues====
===Johto guard glitch===
This occurs with any [[Stadium Cup]]. If there is a previously suspended game and the player is playing a Stadium Cup, suspending the game after a loss causes a warning message to pop up, telling the player that there is already a suspended game. If "Continue without Suspending" is selected, a rematch with the opponent who just defeated the player will be triggered, but no continue will be used.
{{main|Johto guard glitch}}


===Shiny Ditto glitch===
===Languages other than Japanese===
The Shiny Ditto glitch requires a game from [[Generation I]] and [[Generation II]], but only has an effect on a Generation II game. In Generation I, if a Pokémon uses the move {{m|Transform}} while already transformed, after being caught it will retain the {{IV}}s of the Pokémon it transformed into. Due to Shininess being determined by IVs in Generations I and II, this allows the player to make a wild Ditto Shiny by having it use Transform while already Transformed; this can be accomplished by either having a Shiny Pokémon that knows Transform ({{p|Mew}}, certain [[glitch Pokémon]], or a another Ditto), or by teaching a Shiny Pokémon Mimic, then having the wild Ditto use Mimic on the move Transform. While Shiny Pokémon do not exist in Generation I, due to being determined by IVs, this Ditto will be Shiny when traded to Generation II.
====Pokédex data localization====
Due to a localization oversight, using the [[Transfer Pak]] with the English versions of {{g|Stadium 2}} and {{game|Red and Blue|s|Pokémon Blue}} and looking up the locations of [[wild Pokémon]] in the [[Pokédex]] will instead load the corresponding data for the [[Pokémon Blue Version (Japanese)|Japanese version]].


===Trade evolution glitch===
{{YouTubeVid|zPehggPTpzw|ChickasaurusGL|Johto|Kanto}}
[[Generation I]] Pokémon that can evolve by trading can be taught glitch moves through this glitch. This can be achieved by trading a trade evolution Pokémon from a Generation I game to a Generation II, at a level where its evolved form will learn a move not in Generation I. Trading the Pokémon back to the Generation I game will cause the move to become a glitch move.


For example, trading a level 34 {{p|Graveler}} from {{game3|Red and Blue|Pokémon Red|s}} to {{game3|Gold and Silver|Pokémon Gold|s}} will make the Graveler evolve into {{p|Golem}}. Since it is level 34, it will learn {{m|Rollout}}. If it is then traded back to Pokémon Red, it will still have the move, but the game won't recognize it properly since it is a Generation II move, so will become {{m|TM05}}.
==References==
{{reflist}}


==In the side games==
===Pokémon Stadium 2===
====Infinite continues glitch====
The infinite continues glitch is a glitch that can be performed in [[Pokémon Stadium 2]] with any [[Stadium Cup]]. It does not work in the original {{eng|Pokémon Stadium}}. If there is a previously suspended game and the player is playing the [[Stadium Cup]], suspending the game after a loss causes a warning message to pop up, telling the player that there is already a suspended game. If "Continue without Suspending" is selected, a rematch with the opponent who just defeated the player will be triggered, but no continue will be used.
{{-}}
{{Glitches}}<br>
{{Glitches}}<br>
{{Project GlitchDex notice}}
{{Project GlitchDex notice}}


[[Category:Glitches by game]]
[[Category:Glitches by game]]
[[Category:Lists]]


[[de:Bugs in der zweiten Generation]]
[[de:Bugs in der zweiten Generation]]
[[es:Lista de glitches de la segunda generación]]
[[fr:Liste des bugs de la deuxième génération]]
[[it:Elenco glitch in seconda generazione]]
[[zh:游戏漏洞（第二世代）]]

Latest revision as of 01:14, 18 April 2024

This is a list of glitches in the Generation II Pokémon games. It applies to both the original Game Boy Color and the 3DS Virtual Console releases unless otherwise noted.

Some glitches are found on a separate page:

Pokémon Gold, Silver, and Crystal

Celebi Egg glitch

Main article: Celebi Egg glitch

Day Care experience loss

In this generation only, when a Pokémon is withdrawn from the Day Care, its experience is rounded down to the minimum value for the current level. As a result, a Pokémon can lose experience in the Day Care.

For instance, a level 99 Lugia or Ho-Oh has a value between 1,212,873 and 1,249,999 experience points; once it obtains a total of 1,250,000 experience points, it will reach level 100. If a Lugia or Ho-Oh is deposited in the Day Care when it has 1,249,999 experience points (needing just 1 more point to reach level 100), but the player immediately withdraws it without walking any steps, then this Pokémon will revert to exactly 1,212,873 experience points (the minimum amount for level 99), losing 37,126 experience points in the process.

Interregional Teleport quirk

If the player travels to either Kanto or Johto in the S.S. Aqua and then teleports, they will be taken to either the Vermilion or Olivine Pokémon Center as opposed to the last Pokémon Center they used in either region. This does not occur with the Magnet Train. If the player loses a battle during their trip, they will be sent to their cabin instead.

By SM
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Legendary beast cry distortion

When the player checks Entei's Pokédex entry, plays its cry, and then immediately switches to either Suicune's or Raikou's entries, their cry will be distorted.

When the Pokédex is sorted alphabetically, this glitch can also be applied to Espeon's cry.

Pokémon cloning

Main article: List of cloning glitches → Storage system move method
Main article: List of cloning glitches → Trading method

S.S. Aqua map glitch

Initial state of the Pokégear map on the S.S. Aqua, erroneously showing the player's current place as New Bark Town

If the player uses the Pokégear map while travelling on S.S. Aqua, the ship appears as a small sprite at the bottom-right corner. However, the map cursor erroneously selects New Bark Town by default as the player's current place.

It is not possible to select S.S. Aqua in the map. The feature to select S.S. Aqua in the map is technically programmed in the game, but not actually available to the player.

Strain 0 Pokérus

Main article: Pokérus → Generation_II

Pokérus strain values of zero can be generated by the Pokérus generation algorithm with probability 15/255. The primary cause is an incorrectly-placed scratch register copy[1] which expresses when the high four bits are zero. In this case, a part of the logic is skipped, and because the bit test cleared the lower four bits and the higher bits are zero, a value of zero is copied to the scratch register, whose low bits become the strain. The day count of one is then derived from this zero as normal.

Strain zero in Generation II behaves almost as normal: it is visible in the status screen, it triggers the Nurse Joy and Professor Elm dialogues, it spreads as normal, it increases stat experience gain as normal, and it is cured over time as normal. The lone abnormality is that when strain zero is cured, it does not leave the Pokémon in a post-infection state, but in a state as if it had never been infected, like if traded to a Generation I game: it can catch Pokérus again, does not block Pokérus spread, and does not have increased stat experience gain.

Time Capsule glitches

Time Capsule exploit

Main article: Time Capsule exploit

The Time Capsule exploit works around the programming checks put in place on the Time Capsule to prevent players from trading Generation II Pokémon to Generation I games.

Trade evolution learnset

Generation I Pokémon that evolve by trading can be taught glitch moves. This can be achieved by trading such Pokémon from a Generation I game to a Generation II game at a level where its evolved form will learn a move not present in Generation I. Trading the Pokémon back to the Generation I game will cause the move to become a glitch move.

For example, trading a level 34 Graveler from Pokémon Red to Pokémon Gold will cause the Graveler to evolve into Golem. Since it is at level 34, it will learn Rollout in Gold. If it is then traded back to Red, it will still have the move but the game won't recognize it properly since it is a Generation II move, so it will become TM05.

Unown Egg hatching animation

050Diglett.png This section is incomplete.
Please feel free to edit this section to add missing information and complete it.
Reason: Double-check if Unown forms other than the "A" Unown can be seen in the hatching animation

In this generation, when an Unown Egg hatches, the hatching animation displays the "A" Unown regardless of the actual Unown form.

While it is not possible to obtain an Unown Egg in normal gameplay since this Pokémon is in the No Eggs Discovered Egg Group, an Unown Egg is obtainable nonetheless by means such as the Celebi Egg glitch.

Pokémon Gold and Silver

All languages

Cerulean Gym

This bug was carried over from Pokémon Red, Green, and Blue. In Cerulean Gym, the water tiles have wild Pokémon data programmed in, which allows players to fish Pokémon. It was already corrected in Pokémon Yellow and it was fixed again in Pokémon Crystal. This likely happened because while Yellow came out after Red and Blue did, Red and Blue were already being used as the base of Gold and Silver due to Yellow not existing yet.

Trainer House

Main article: Trainer House glitches

English language

Coin Case glitches

Main article: Coin Case glitches

The Coin Case glitches are a set of glitches which occur exclusively in the English versions of Pokémon Gold and Silver. They allow the player to run arbitrary code by exploiting an oversight in the process used by the game to print the text box data for the Coin Case.

When the game is played on the Game Boy or Super Game Boy instead of the Game Boy Color, the effects caused by the oversight are more limited.

Japanese language

Bug-Catching Contest

Main article: Bug-Catching Contest glitch

In the Japanese versions of Pokémon Gold and Silver, if the player uses Fly or Teleport to leave the National Park during a Bug-Catching Contest, the game will treat the contest as still ongoing.

This may also be used to create unstable Pokémon data.

By ChickasaurusGL
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Pokémon Crystal

All languages

Clair gift glitch

In Crystal, if the player whites out due to poison damage while still inside the Dragon Shrine at Dragon's Den after receiving the Rising Badge, they can return to the Blackthorn Gym to receive the reward TM from Clair. However, due to an oversight, if the player then returns to Dragon's Den and stands on the tile directly in front of the Dragon Shrine's door, Clair will appear again and give the player another TM24 (DragonBreath), as if they hadn't already received it.

By ChickasaurusGL
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Pokémon meeting level glitch

In Pokémon Crystal, the level and time of day when a Pokémon was originally caught, hatched, or received is stored in the game data and can be verified by visiting the Poké Seer. However, this only works correctly for Pokémon met up to level 63.

This Pokémon meeting data is condensed into a single byte, the upper two bits represent the time it was met, and the lower six bits represent the level it was met. For example, a level 70 Pokémon met in the morning will be reported as a level 6 Pokémon met in the day by the Poké Seer.

This glitch does not usually affect the gameplay for these reasons:

  • In Pokémon Crystal, there are no available Pokémon met over level 60 (other than Pokémon from in-game trades). The in-game event Ho-Oh and Lugia are both found at this level, even though they had been available at level 40 or 70 in earlier games.
  • Pokémon obtained from in-game trades do not record any Pokémon meeting data. Those Pokémon are received with the same level as the player's traded Pokémon, but they are not affected by this glitch.
  • The Generation I games and Pokémon Gold and Silver do not record the meeting data of any Pokémon, therefore the Pokémon caught in those games are not affected by this glitch even if they are transferred to Pokémon Crystal.

In Pokémon Crystal, any Pokémon obtained with a high enough level from event distributions had their meeting data incorrectly recorded because of this glitch. In particular, this affected the level 70 Shiny Mewtwo received from Pokémon Center New York.

By ChickasaurusGL
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Languages other than Japanese

Legendary beasts incomplete OT check

In Crystal, when the player talks to Eusine in the Celadon City Pokémon Center he will report a rumor that a rainbow colored Pokémon has appeared in Tin Tower (Ho-Oh) and leave the building when Suicune, Raikou or Entei appear in the party and/or storage boxes with OT and ID data matching that of the player. Due to a glitch, the English version of Crystal will only check the first five characters of the player's name. For example, if the player's name was “CRYSTAL”, then having the legendary beasts with the OT name “CRYST” and a matching ID of the player will enable the event. This is due to the player names in the original Japanese version being a maximum of five characters long and the English version failing to account for the change.

By ChickasaurusGL
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Japanese language

Pokémon Communication Center

In the Japanese version of Pokémon Crystal, address $A800 in SRAM triggers a script in the Pokémon Communication Center that may be arbitrarily set to values other than 0x00 when the game does not currently have a save file; otherwise, its value is correctly set to 0x00. This causes all sort of bugs, like crashes, freezes, and other random behavior.

While the purpose of this script is not known, it appears to be related to the Mobile System GB. In the localizations, although the related code is unused, this issue was fixed by adding a check that looks up the value of address $A800 and automatically resets it to 0x00.[2]

By ChickasaurusGL
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


German language

Dude freezing glitch

On the Virtual Console release of German Crystal, if the player has full boxes while the dude wants to present how to catch Pokémon, the game will freeze. Other languages of Crystal freeze or reset the game with the 'Game Boy Color only' message in different ways.

Dude money glitch

On the German cartridge version of Crystal, when doing the Dude glitch, trying to use the Poké Ball shows:

Die POKéMON-BOX
ist voll. Das
kannst du jetzt
nicht benutzen.

This message also glitches the left side of the screen. Another message is shown:

KUMPEL hebt
$###### auf!

If the tutorial is accepted again, the player is left with $999999.

By ChickasaurusGL
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Pokémon Stadium 2

All languages

Depositing a held Key Item

If a Pokémon is holding a Key Item in the Generation II (such as by using the Celebi Egg glitch), this item can be deposited normally in the Metal Case from the PC in Pokémon Stadium 2 and then transferred to another Generation II game.

For instance, this can be used to transfer a Squirt Bottle between Generation II games for the purpose of sequence breaking.

Infinite continues

This occurs with any Stadium Cup. If there is a previously suspended game and the player is playing a Stadium Cup, suspending the game after a loss causes a warning message to pop up, telling the player that there is already a suspended game. If "Continue without Suspending" is selected, a rematch with the opponent who just defeated the player will be triggered, but no continue will be used.

Languages other than Japanese

Pokédex data localization

Due to a localization oversight, using the Transfer Pak with the English versions of Pokémon Stadium 2 and Pokémon Blue and looking up the locations of wild Pokémon in the Pokédex will instead load the corresponding data for the Japanese version.

By ChickasaurusGL
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


References

  1. ↑ pret/pokegold: pokerus.asm line 54
  2. ↑ pokecrystal/mobile_45.asm at master · kanzure/pokecrystal · GitHub


Multiple
generations 		Transform glitches • Glitch Trainers • Cloning glitches • Error messages • Arbitrary code execution
Generation I Glitches • Battle glitches • Overworld glitches
-- • 0 ERROR • Broken hidden items • Cable Club escape glitch • Dual-type damage misinformation
Experience underflow glitch • Fight Safari Zone Pokémon trick • Glitch City • Item duplication glitch • Item underflow
Mew glitch • Old man glitch • Pewter Gym skip glitch • Pokémon merge glitch • Rhydon glitch • Rival twins glitch
Select glitches (dokokashira door glitch, second type glitch) • Super Glitch
Time Capsule exploit • Walking through walls • ZZAZZ glitch
Generation II Glitches • Battle glitches
Bug-Catching Contest glitch • Celebi Egg glitch • Coin Case glitches • Experience underflow glitch
Glitch dimension • Glitch Egg • Teru-sama • Time Capsule exploit • Trainer House glitches • GS Ball mail glitch
Generation III Glitches • Battle glitches
Berry glitch • Dive glitch • Pomeg glitch • Glitzer Popping
Generation IV Glitches • Battle glitches • Overworld glitches
Acid rain • GTS glitches • Pomeg glitch • Rage glitch
Surf glitch • Tweaking • Pal Park Retire glitch
Generation V Glitches • Battle glitches • Overworld glitches
Charge Beam additional effect chance glitch • Charge move replacement glitch • Choice item lock glitch
Frozen Zoroark glitch • Sky Drop glitch
Generation VI Glitches • Battle glitches • Overworld glitches
Charge Beam additional effect chance glitch • Charge move replacement glitch • Choice item lock glitch
Lumiose City save glitch • Symbiosis Eject Button glitch • Toxic sure-hit glitch
Generation VII Glitches • Battle glitches
Charge Beam additional effect chance glitch • Charge move replacement glitch • Choice item lock glitch
Toxic sure-hit glitch • Rollout storage glitch
Generation VIII Glitches
Charge Beam additional effect chance glitch • Charge move replacement glitch • Choice item lock glitch
Toxic sure-hit glitch • Rollout storage glitch • Party item offset glitch
Generation IX Glitches
Glitch effects Game freeze • Glitch battle • Glitch song
Gen I only: Glitch screen • TMTRAINER effect • Inverted sprites
Gen II only: Glitch dimension
Lists Glitches (GO • Mystery Dungeon • TCG GB • Spin-off)
Glitch Pokémon (Gen I • Gen II • Gen III • Gen IV • Gen V • Gen VI • Gen VII • Gen VIII)
Glitch moves (Gen I) • Glitch types (Gen I • Gen II)


Project GlitchDex logo.png This glitch Pokémon article is part of Project GlitchDex, a Bulbapedia project that aims to write comprehensive articles on glitches in the Pokémon games.
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