List of glitches in Generation II

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This is a list of glitches that occur in the Generation II Pokémon games.

Gold and Silver

Bug-Catching Contest

Main article: Bug-Catching Contest data copy 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 creates unstable Pokémon data.

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

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.

Coin Case

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.

Trainer House

Main article: Trainer House glitches


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 Pokémon 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.[1]

By ChickasaurusGL
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Gold, Silver, and Crystal

Battle system

Belly Drum effect

When a Pokémon uses Belly Drum, its HP is deducted by 50% and its Attack stat raised by up to 12 stages, ensuring that even the Attack stat of a Pokémon with an Attack stage of -6 can be maximized. This is accomplished through executing the command used by Swords Dance by a maximum of 6 times; however, the command is erroneously called once before verifying that HP of the user can be deducted by 50%. This means that if the user doesn't have enough HP to use the move, the Attack stat will be incorrectly boosted by 2 stages. The game will state that the attack has failed.

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

Catch rate

The status conditions of paralysis, burn, and poison, increase the catch rate by 0 as opposed to by 5.

The Love Ball only gains a catch rate of 8× on Pokémon of the same gender and species as the player's Pokémon, rather than on Pokémon of the opposite gender.

The Moon Ball is supposed to multiply the catch rate by 4 on Pokémon that evolve with Moon Stone but instead does this on Pokémon that evolve with Burn Heal. Subsequently, Moon Ball does not have any additional effect and always acts like a Poké Ball.

The Fast Ball only quadruples the catch rate against the first three of all fleeing Pokémon: Magnemite, Grimer, and Tangela.

Ditto assumption

Any Pokémon that uses Transform is regarded as a Ditto in its new form; this means that if the player catches a Mew or a glitch Pokémon which has used the move Transform or a Pokémon which has used Transform via Mirror Move, instead they will obtain a Ditto. Mew turning into Ditto is not an issue because wild Mew cannot be legitimately encountered.

In Pokémon Crystal, this bug only affects Sketch because Mirror Move will fail against Transform.

Dragon Fang effect

The Dragon Scale boosts the power of Dragon-type moves rather than the Dragon Fang.

Exp. Share formula

A Pokémon with the same original Trainer as the player that is sent into battle with an Exp. Share held will gain 50% of the experience twice, which, due to rounding, may not equal 100%.

Experience amount

A Pokémon that gains an amount of experience consisting of five digits will not have the number displayed correctly but this is only possible with an outsider Pokémon holding a Lucky Egg used at the Trainer House. The lowest level required for achieving such feat is 82 for Pokémon with an experience yield of 255, and the lowest experience yield with which this is feasible with is 208.

By Dukstless
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Experience underflow

Main article: Experience#Experience underflow glitch

Level 1 Pokémon using the "medium-slow" growth algorithm will jump from level 1 to level 100 after gaining a low amount of experience points (less than 54 if the total experience is 0).

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

HP bar animation

A Pokémon which HP is greater that 49 will deplete the HP bar at a slower rate than intended when taking damage. Due to an issue with the order of the code within the game, a value that would help to set a delay that was partially dependent on the maximum HP of the Pokémon instead sets always sets a delay that does not change with different HP values. This results in extra delays in the animation updating and prolongs the animation of the bar dropping.

A Pokémon with 48 HP or less is not affected as each HP is equal to one or more pixels of the HP bar, thus skipping any delay.

By Crystal_
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Leveling past 100

If a Pokémon is obtained at a level above 100 (101-254), 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 reset to 0. If a Pokémon above level 100 levels up due to experience, its level will be reset to 100.

Nightmare damage bug

If Nightmare is used on an in-game trainer's sleeping Pokémon which is then awakened by a Full Heal or other such healing item, then the Pokémon will still be harmed by Nightmare even though it is not asleep.

By ChickasaurusGL
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Park Ball graphics corruption

If the Park Ball is used from the Ball pocket of the player's Bag on a wild Pokémon, the game will not reload the graphics on the battle screen, causing a temporary glitch in which part of both the Bag and battle screens mix up until the Pokémon catching animation is over, at which point the game will show the battle screen being reloaded.

Present damage

Main article: Present (move)#Generation II

In Pokémon Gold and Silver, the move Present has a damage formula of its own. This causes the level, Attack, and Defense variables of the regular damage formula to be replaced. Thus, the move deals unusually large or small amounts of damage, depending on the Pokémon.

In Pokémon Crystal, this bug was fixed for regular battles by having Present use the standard damage formula. The old formula from Gold and Silver is still used during link battles to preserve backwards compatibility.

Shiny Transform switch

If a transformed Pokémon defeats a Trainer's Pokémon and the player switches it out to a Shiny Pokémon when prompted to, the transformed Pokémon will have a Shiny pallette while being switched. This does not happen if player switches Pokémon normally.

By BrightcynderPhase2
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Main article: Sketch glitch

Thick Club effect

If a Marowak with an Attack stat equal or higher than 256 uses Swords Dance while holding a Thick Club, its Attack will be reduced by 1024 (minimum 1) during damage calculation only. This happens as a consequence of an oversight that causes the temporary Attack boost from Thick Club to ignore the stat cap of 999 unlike other stat modifiers. During damage calculation, both the attacker's (Special) Attack stat and the defender's (Special) Defense stat are modded by 256, and, prior to that, if either is higher than 255, both are temporarily divided by 4. Thus, stats that are equal or higher than 1024 (256×4) will be treated wrongly.

In Pokémon Crystal, this bug was fixed for regular battles but still occurs during link battles to preserve backwards compatibility.

This behavior also applies to Pikachu holding Light Ball and to Ditto holding Metal Powder. However, these Pokémon need to receive boosts from a Pokémon that knows Baton Pass in order to be able to reach a stat of at least 1024.

Trainer Counter/Mirror Coat damage

In Trainer battles only, if the player uses a healing item or a Poké Ball during the same turn as the opponent's Counter or Mirror Coat, their damage will be of at least 4 HP, twice the minimum standard damage for neutral moves (2 HP).

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

Time Capsule

Main article: Time Capsule exploit

Shiny Ditto DV manipulation

In Generation I, if a Pokémon uses the move Transform while already transformed, it will retain the DVs of the Pokémon it transformed into after being caught. Due to Shininess being determined by DVs in Generation II, this allows the player to make a wild Ditto Shiny by having it use Transform while already transformed; accomplishing this is possible by either having a Shiny Pokémon that knows Transform (Mew, certain glitch Pokémon, or another Ditto) or by teaching a Shiny Pokémon the move Mimic, then having the wild Ditto use Mimic on the move Transform. The end result is that the Ditto will be Shiny in the Generation II game.

By v0id19
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

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.


Celebi Egg glitch

Main article: Celebi Egg glitch

Interregional Teleport quirk

If the player travels to either Kanto or Johto in the S.S. Aqua and then teleports, he or she 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 channel/SM
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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.

Pokémon cloning

Main article: Cloning glitches#Storage system method
Main article: Cloning glitches#Trading method

Stadium 2

Pokémon Stadium 2 fixed the following bugs from Pokémon Gold, Silver, and Crystal:

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.

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.


Cloning glitchesGlitch PokémonGlitch Trainers
Error messagesArbitrary code execution
Generation I: --0 ERRORBroken hidden itemsCable Club escape glitchExperience underflow glitch
Fight Safari Zone Pokémon trickGlitch CityItem duplication glitchItem underflowMew glitch
Old man glitchPewter Gym skip glitchPokémon merge glitchRhydon glitch
Select glitches (dokokashira door glitch, second type glitch) • Super GlitchTime Capsule exploitZZAZZ glitch
Generation II: Bug-Catching Contest data copy glitchCelebi Egg glitchCoin Case glitchesExperience underflow glitch
Glitch dimensionGlitch EggSketch glitchTeru-samaTime Capsule exploitTrainer House glitches
Generation III: Berry glitchDive glitchPomeg glitchGlitzer Popping
Generation IV: Acid rainGTS glitchesMimic glitch
Pomeg glitchRage glitchSurf glitchTweakingPal Park Retire glitch
Generation V: Sky Drop glitchFrozen Zoroark glitchChoice item lock glitch
Generation VI: Lumiose City save glitchSymbiosis Eject Button glitchChoice item lock glitch
Generation VII: Choice item lock glitch
Glitch effects: Game freezeGlitch battleGlitch song
Gen I only: Glitch screenTMTRAINER effectInverted sprites
Gen II only: Glitch dimension
Lists: Glitch movesGlitch types
Glitch Pokémon (Gen IGen IIGen IIIGen IVGen VGen VIGen VII)
Glitches (Gen IGen IIGen IIIGen IVGen VGen VIGen VIISpin-off)

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.