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'''Glitches''' are anomalies in software programs, including video games. They can cause various problems ranging from the purely graphical to completely wiping entire chunks of saved data.
[[File:LM4 encounter.png|right|thumb|Encountering the glitch Pokémon [[ゥL ゥM 4]] by using the [[Mew glitch]]]]


They are usually caused by problems with a game's code, or from a player doing things the programmers did not anticipate, therefore causing the game to react unexpectedly. Below is a list of glitches in the Pokémon video games.
A '''glitch''', also known as '''bug''', is a software error that can lead to unintended behavior in software like the [[Pokémon games]]. It can be triggered from mistakes within the game's code or by exploits that were not anticipated by the programmers, thus causing the game to react unexpectedly. Glitches present in Pokémon games can have a variety of effects, such as the disruption of graphics or audio effects, the appearance of [[glitch Pokémon]], the corruption of [[save]] data, or a [[game freeze]] where the game must be restarted to continue.


==Major glitches==
When noticed, glitches may be fixed by its developers in later releases of a game or derivative games. In some games, such as {{game|Ruby and Sapphire|s}} and {{g|X and Y}}, {{wp|Patch (computing)|patch}}es are released that fix glitches in Pokémon games directly.
[[image:Glitch City Map1.jpg|thumb|right|250px|A variation of [[Glitch City]]]]
[[image:Wildmew.jpg|thumb|right|A {{p|Mew}} being found in the wild]]
There are three glitches (the first two are only available in the Red, Blue and Yellow versions; the third one is available in the Gold/Silver and Emerald versions, and the [[Hall of Fame]] one is very minor) that do not ''necessarily'' always create glitched Pokémon, but are themselves glitches that cause events that would not normally happen in the gameplay.
 
===Generation I===
* '''[[Glitch City]]:''' A glitch location consisting of mess of random map tiles that changes depending on the location where the player enters Glitch City. <ref>http://www.trsrockin.com/glitchcity.html</ref>
* '''[[Mew glitch]]:''' Allowing players to capture any Pokémon (most especially {{p|Mew}}) without modification, and allowing players to catch most of the glitched Pokémon. <ref>http://www.trsrockin.com/mewtrick.html</ref>
 
===[[Generation I|Generations I]] - {{gen|IV}}===
* '''[[Pokémon cloning]]:''' Variations of the Pokémon cloning trick exist in each [[Generation]] of the Pokémon games, each slightly different from one another. The most reliable version is in [[Generation II]]. This Pokémon cloning version allows players in the Gold/Silver versions to safely clone Pokémon, assuming they have at least somewhat decent timing.<ref>http://www.cheatsnetwork.com/cheats/2705.html</ref>
* '''[[Sprite glitch]]:''' Glitches that mess up sprites have occurred in all generations (mostly by [[cheating]]).
 
===Generation IV===
* '''[[Surf glitch]]:''' allows players to warp to places on the map where {{p|Darkrai}} and {{p|Shaymin}} lie. '''Note:''' This only works in some of the first Japanese versions to be released.<ref>http://uk.answers.yahoo.com/question/index?qid=20070528172817AAWWH8x</ref>
* '''[[Tweaking]]:''' This causes the game to fail to load the map and makes it appear black. Some cases have led the {{player}} to places such as [[Newmoon Island]] or [[Flower Paradise]] if the player goes the right way.
 
== Minor glitches ==
==={{game|Red and Blue|s}}===
* '''[[Rare Candy cheat]]''': An in-game glitch which is the result of encountering a [[Missingno.]] or [['M]], giving the player over 100 of the player's 6th item (this is also known as the "Old Man Glitch").
* '''Hall of Fame Glitch:''' When Missingno. has been seen on the save file, the player's Hall Of Fame is badly corrupted with entirely different Pokémon (players can even see Mew in the Hall Of Fame, whether they've seen Mew or not) and very glitched characters and names.
* '''Man on roof of [[Cinnabar Gym]]''': If one does not have the key to the Cinnabar Gym, and {{m|surf}}s on the east coast and returns to land directly infront of the gym, a man will appear on the roof of the gym. A similar effect happens if the player walks into the [[Vermilion City]] Gym, walks directly left and then up so that they are facing the bottom-left trash can and press A to inspect it. One of the trainers in the gym will be misplaced and return to his usual spot once the text box disappears.
* '''Prevented progress''': If one evolves their starter Pokémon before they obtain their Pokédex from Prof. Oak, the game will assume that, since they have 2 Pokémon registered as caught, that they already have a Pokédex, and will not allow them to proceed.
* '''Invisible PC''': There is a hotel in [[Celadon City]] that resembles a [[Pokémon Center]] on the inside. In the top-right space of the area that the player can walk on, there is an invisible, usable PC.
*'''[[S.S. Anne]] Truck''': If a player gets a Pokémon which knows cut (HM01) through a trade <i>before</i> actually obtaining HM01 during gameplay, the player will be able to skip the S.S. Anne. Later on, after obtaining HM03 (surf) and teaching it to a Pokémon, the player will be able to surf around the vicinity of the S.S. Anne. On one piece of land, there will be a truck which has no apparent purpose.
*'''[[Q Glitch]]''': A glitch enabled by the Pokémon [[Q]] (and [[Charizard 'M]]) which allows Pokémon stored in the PC to swap moves and stats.
*'''[[ZZAZZ glitch]]''': A bizarre side effect of the [[Mew glitch]] using a Pokémon with a special stat of 251, 252, 254 or 255. When this is done, a [[Glitch Trainer|Glitch trainer]] will appear. In the Red and Blue versions, after battling the Glitch trainer, numerous abnormalities will occur, including the player's name being turned into "ZZAZZ" and 3 of the player's Pokémon being turned into Bulbasaurs. It has been known to erase a player's saved game. The abnormalities which occur in the Red/Blue version are not the same as those which occur in the Yellow version.
 
==={{game2|Gold|Silver|Crystal}}===
* '''[[Glitch dimension]]:''' Turns everything into strange, random colors and slows the ability to see the party screen and changes the "Poké" in PokéGear to random symbols. It is usually activated by first using the [[Coin Case]] and then speaking to the {{p|Machop}} at [[Vermilion City]].
* '''Dratini glitch''': After the player speaks to the {{p|Dratini}} in [[Blackthorn City]] and uses the Coin Case, the Coin Case's display will change what the coin case says from "Coins: ..." to "Which move?he pp of" permanently unless the game is turned off.
* '''"Reset the clock" glitch''' (Gold/Silver only): A glitch that allows players to manually reset the games' clock by entering a password unique to the player's ID and the amount of currently owned money. It was fixed in Crystal.
*'''[[Celebi Egg Trick]]''': Allows players to capture {{p|Celebi}} using a number of steps.
 
==={{game|Ruby and Sapphire|s}}===
* '''Hill glitch''': East of [[Mauville City]] there is an [[Aroma Lady]] that will battle the {{player}}. If the player stands right behind the hill in her line of sight, she will see the player and walk onto the hill and stay there until the player leaves the area. This does not happen in Emerald due to her being a part of a double battle in the same area.
* '''[[Berry glitch]]''': Freezes the growth of any berries which have been planted but not harvested, often occurs after the game has been owned for a year or played for over 100 hours, though not always.
* '''[[Pomeg glitch]]''' ({{V|Emerald}} only): A glitch involves negative HP.
 
===[[Pokémon Colosseum]]===
*'''[[Colosseum Master Ball glitch]]''': Also known as the Infinite Ball Glitch; it is a glitch which involves battling different Pokémon in order to keep the number of balls in the bag from going down.
 
==={{game|Platinum}}===
*'''[[Acid rain]]''': Rain falls on the battlefield when a Pokémon is knocked out with Pursuit during Hail or Sandstorm.


==Glitch Pokémon==
==Glitch Pokémon==
{{main|Glitch Pokémon}}
{{main|Glitch Pokémon}}
A glitch [[Pokémon]] is a Pokémon that exists in a game due to a programming or level design oversight or for beta testing, and as it was not intentionally placed inside the game by [[Nintendo]] or [[Game Freak]], it might be hazardous to saved data. They were originally supposed to be place-holders for unused Hex-addresses in the game. Glitch Pokémon are to be avoided due to the risks they may pose to a player's save file.
Glitch Pokémon are caused by glitches that have the game erroneously read placeholder data or non-Pokémon data as Pokémon data. Although many glitch Pokémon draw all their characteristics from data intended to be used elsewhere, some glitch Pokémon may have partially defined characteristics that are not intended to be accessed in-game: for example, in the case of [[MissingNo.]], its name is well-defined, but its [[base stat]]s are read from data intended to represent the parties of several {{tc|Biker}}s.
===In {{3v2|Red|Blue|Yellow}}===
This is a chart of all 24 known glitch Pokémon that can be found in the wild in the Red, Blue and Yellow versions ''without'' using a cheating device<ref>http://www.trsrockin.com/glitchdex.html</ref>:
<BR CLEAR=left>
{| border="1" cellpadding="2" cellspacing="0"
! bgcolor ="#efefef"| No. (Red/Blue)
! bgcolor = "#efefef"| No. (Yellow)
! bgcolor = "#efefef"|[[Mew glitch]] special required
! bgcolor="#efefef"| Red/Blue version's equivalent
! bgcolor="#efefef"| Yellow version's equivalent
|-
| #000|| #000 ||| Many ||| '''[[Missingno.]]''' ||| '''[[Missingno.#Missingno. in Pokémon Yellow|Missingno. (Yellow)]]'''
|-
| #000|| #176 ||| N/A ||| '''[['M]]''' ||| '''[[3TrainerPoké]]'''
|-
|#061 || #080 ||| 192 ||| [[A (lowercase)|a]] ||| [[44Hy]]
|-
|#250 || #250 ||| 191 ||| [[A (uppercase)|A]] ||| [[4 4]]
|-
|#062 || #079 ||| 198 ||| [[LM4]] ||| [[7g]]
|-
|#094 || #015 ||| 195 ||| [[h POKé]] ||| [[Z4]]
|-
|#205 || #205 ||| 193 ||| [[Chiisai-u]] ||| [[♀]]
|-
|#205 || #203 ||| 196 ||| [[PokéWTrainer]] ||| [[X - x]]
|-
|#205|| #006 ||| 199 ||| [[p T]] ||| [[Glitchy Charizard]]
|-
|#234 || #230 ||| 194 |||  [[.4]] ||| [[pPkMnp]]
|-
|#250 || #055 ||| 197 ||| {{OBP|PkMn|Glitch Pokémon}} ||| [[4. .]]
|-
|#000 ||#121 ||| N/A ||| [[Charizard 'M]] ||| [[Q]]
|-
|}
 
''Sources:''
 
*''[http://www.trsrockin.com/glitchdex.html http://www.trsrockin.com/glitchdex.html]''
 
*''[http://www.trsrockin.com/hexlist.html http://www.trsrockin.com/hexlist.html]''
 
*''[http://www.trsrockin.com/bizarre.html http://www.trsrockin.com/bizarre.html]''
 
*''[http://www.trsrockin.com/linkcable.html http://www.trsrockin.com/linkcable.html]''
 
*''[http://www.trsrockin.com/tales.html http://www.trsrockin.com/tales.html]''
 
===Non-obtainable glitch Pokémon===
The following [[Glitch Pokémon]] can only be found by using a cheating device such as [[GameShark]] and cannot be caught using the [[Mew glitch]] or any other known in-game trick.
 
====In [[Pokémon Red and Blue|Red and Blue]]====
 
*[[$]]
*[[ゥU?]]
*[[.g]]
*[[.G'Mp]]
*[[7PkMnv]]
*[[8]]
*[[94 (glitch Pokémon)|94]]
*[[Glitch (EC)|EC]]
*[[Glitch Nidorino]]
*[[Ké......]]
*[['Ng'Mp]]
*[[PkMn n]]
 
====In {{v2|Yellow}}====
 
*[[ゥゥ♂]]
*[[ゥゥ(box bracket)|ゥゥ<nowiki>]</nowiki>]]
*[[ゥ(I']]
*[[(h4to89]]
*[[g]]
*[[gJ1]]
 
====In {{3v2|Gold|Silver|Crystal}}====
 
The following glitched Pokémon can be found in the [[Pokémon Gold and Silver Versions|Gold/Silver]] versions, but require [[GameShark]] to complete them. (Note: after capturing these Pokémon, the game's graphics have been known to falter, and the player will find themselves in a [[Glitch City]]-like area.)<ref>http://www.trsrockin.com/dex_252.html</ref><ref>http://www.trsrockin.com/gs_mn.html</ref>
{| border="1" cellpadding="2" cellspacing="0"
! bgcolor ="#efefef"| No. (Gold/Silver)
! bgcolor = "#efefef"|[[GameShark]] code required
! bgcolor = "#efefef"|Gold/Silver equivalent
|-
| #000|| 0100EDD0 ||| [[Five question marks]] (000)
|-
| #252|| 01FCEDD0 ||| [[Five question marks]] (252)
|-
| #253|| 01FDEDD0 ||| [[Glitch egg]]
|-
| #254|| 01FEEDD0 || [[Five question marks]] (254)
|-
| #255|| 01FFEDD0 || [[Five question marks]] (255)
|}


====In [[Pokémon Ruby and Sapphire Versions|Pokémon Ruby, Sapphire]], [[Pokémon Emerald Version|Emerald]], [[Pokémon FireRed and LeafGreen Versions|FireRed, and LeafGreen]]====
==Glitch moves==
* #000 [[Ten question marks]]
{{main|Glitch move}}
* #000 [[Eleven question marks]]
A [[glitch move]] is a [[move]] not intended to be part of the game, but accessible via glitches or cheating devices. While some glitch moves have no effect whatsoever, others may cause the game to [[game freeze|freeze]] when attempting to perform them. Usually, only [[glitch Pokémon]] will learn glitch moves.
* #000 [[Twelve question marks]]
* #390 [[Question mark]]
* #?87 [[Ten question marks]]
* #??? [[Bad egg]]
* #??? [[B óË ÁN]]
* #??? [[Q:]]
* #252 [[-]]


====In {{game|Diamond and Pearl|s}}====
In [[Generation I]], Ditto can be taught the glitch move {{m|--}} by {{DL|List of glitches (Generation I)|--|a glitch}}. Additionally, {{DL|List of glitches (Generation II)|Trade evolution learnset|another glitch}} present in the [[Time Capsule]] allows Pokémon that evolve by trading to be taught several glitch moves.
* #??? [[Invisible Shiny Bulbasaur]]
* #??? [[DPbox]]
* #??? [[Bad egg]]


===Glitch Pokémon gallery===
==Glitch types==
<gallery>
{{main|Glitch type}}
image:Missingno.jpg|[[Missingno.]]
image:LM4found.PNG|[[LM4]]
image:Alowercase.jpg|[[A (lowercase)|Lowercase a glitch Pokémon]]
image:XxGlitch.jpg|The [[X - x]] glitch Pokémon
image:DittoQGlitch2.jpg|In this screenshot, a {{p|Ditto}} transformed into the player's [[Q]], and then the player sent out a {{p|Spearow}}
image:Hpoke.jpg|[[H POKé]], a difficult-to-catch glitch Pokémon
image:000MissingnoGSC.png|"[[Five question marks]]", a glitch Pokémon which accounts for the hexadecimal slots 000, 252, 254 and 255 in the Gold/Silver versions
Image:253GSCEgg hatch.png|[[Glitch egg]], which accounts for the hexadecimal slot 253 in the Gold/Silver versions
image:MissingnoYellow.jpg|[[Missingno.]] found in the {{v|Yellow}}
image:7 g.png|[[7g]] being encountered in the Yellow version
image:FemaleSymbol4.PNG|[[♀|♀ (female symbol glitch)]] being encountered in the Yellow version
</gallery>


==Glitch Characteristics==
[[Glitch type]]s are [[type]]s that are solely used for glitch Pokémon or glitch moves. The {{t|Bird}} type is a leftover type thought to be a beta version of the {{type|Flying}}. All other glitch types are caused by erroneously reading other data as a type. Unlike regular types, glitch types often do not have any weaknesses, resistances, or immunities.
===Glitch attacks===
A glitch attack, or glitch [[move]], is much like a regular attack except the results are often undesirable. Like with glitch Pokémon, glitch attacks were not programmed into the game on purpose and many have been proven to cause damage to game cartridges. The only widely known ones are those for Pokémon Red, Blue and Yellow. Glitch attacks are sometimes displayed as TM attacks ('''TM01'''-'''TM55''' and '''HM01''' to '''HM05'''), but some have no name or a glitched, unreadable name. Some attacks are of known glitch types (see list below), but most have either no type or an unknown type, and are often referred to as "[[Super Glitch|Super Glitches]]" (see [[List of glitch moves]]).


There are ways to teach glitch attacks to certain Pokémon without usage of a cheat-code device such as [[GameShark]], however, most of the time only glitch Pokémon will learn glitch attacks.
==Glitch locations==
There are several glitch locations which can only be reached by means of glitches or hacks. One of the most well known glitch locations is [[Glitch City]]. Several glitch locations part of the [[Sevii Islands]] are retrievable by their [[index number]] pointers and do not have any other data; only [[Pokémon FireRed and LeafGreen beta#Sevii Isles|Sevii Isles 8 and 9]] have actual map data. There are also other beta locations such as [[Pokémon Gold and Silver beta|an unused Safari Zone]] in [[Generation II]].
One way of teaching a Pokémon in [[Generation I]] a glitch move is trading to a [[Generation II]] game a Pokémon that will evolve by trading at a level when it will learn an attack in the next generation game, and then trading it back to the Generation I game. For example, trading a level 50 {{p|Haunter}} from {{game|Red}} to {{game|Gold}} will make the Haunter evolve into {{p|Gengar}}.  Since it is level 50, it will learn {{m|Destiny Bond}}. If you trade it back to Pokémon Red, it will still have the move, but the game won't recognize it since it is a Generation II move.


Also, the move {{m|Thunderbolt}}, when used in some Ruby and Sapphire cartridges, may cause the game to [[Game freeze|freeze]].
==Glitch items==
===Glitch types===
{{Main|List of unobtainable items}}
There are many different glitch types that are found to be the types of several glitched Pokémon. The most well known are:
Placeholder items are often intentionally left in the game's code to prevent the game from crashing if the data is accessed, but without the intention to be accessible in-game. Placeholder items, such as the [[Teru-sama]] item in [[Generation II]], often appear at the end of the games' [[List of items by index number|internal item list]]s.


* {{type2|Bird}}, one of the types of the Red/Blue [[Missingno.]]
Placeholder items may become regular items in later games of a generation: The [[GS Ball]], [[Clear Bell]], and [[Egg Ticket]], which only appear in {{game|Crystal}}, are programmed into the games' {{gdis|List of items by index number|II|internal list}}s in places of Teru-sama items in {{game|Gold and Silver|s}}; if a corresponding Teru-sama is held by a Pokémon in those games, it will transform when being traded to Crystal.
* [[999 (type)|99||9]] (A glitch type), one of the types of [[4 4]] and one of the types of the [[Missingno.|Yellow version Missingno.]]
* {{type2|Pokémaniac}}, the type of the malicious glitch Pokémon "[[.4]]"
* [[L|:L (type)]], one of the types of [[Ké......]].
* [['|) m) ZM Normal (type), the types of the mysterious ? marks glitches of the [[Generation II|2nd Generation]]
* Rival (type), has the name of the player's rival.


===Glitch areas===
Glitch items that will become regular items in a later game appear in [[Generation II]] and [[Generation IV]]. In [[Generation III]], all items introduced in {{game|FireRed and LeafGreen|s}} or {{game|Emerald}} are stored in a section of the [[List of items by index number (Generation III)|internal item list]] that is not accessible in an earlier game. Except for the [[Griseous Orb]] (which replaces a glitch item from {{game|Diamond and Pearl|s}}), the same holds for all items introduced in {{game|Platinum}} and {{game|HeartGold and SoulSilver|s}}, as well as for all items introduced in games of a later generation.
Aside from Glitch City in [[Generation I]], there are several other areas which can only be reached by way of a glitch in the games. Examples of this are areas in the [[Sevii Islands]] that are retrievable via their [[index number]] pointer, however, do not have any other data. [[Sevii Isle 8]] and [[Sevii Isle 9]] are the only index number areas which have actual map data.


===Glitch items===
==Glitch Trainers==
In the [[Generation II]] games, it is possible to get an item called the [[Teru-sama]], the only description of which is a lone question mark. [[Generation III]] likewise has a mystery item. Both of these seem to have been placeholders just in case more slots for items were ever needed, something that came true with the [[Clear Bell]] in [[Pokémon Crystal Version|Crystal]] and the various newer items introduced just in [[Pokémon FireRed and LeafGreen Versions|FireRed and LeafGreen]] and [[Pokémon Emerald Version|Emerald]], which register as the Teru-sama and mystery item if they are somehow moved into [[Pokémon Gold and Silver Versions|Gold and Silver]] or [[Pokémon Ruby and Sapphire Versions|Ruby and Sapphire]]. There is also the Seal Bag, a glitch item obtained from the [[Generation IV]] [[Global Trade Station|GTS]] glitch.
{{main|Glitch Trainer}}
[[Glitch Trainer]]s exist in [[Generation I]] and [[Generation II]]. They result from the game erroneously reading Trainer or party information from game code that is supposed to contain other information.


The Teru-sama is a glitch item, but can be transformed into the [[GS Ball]] if it is given to [[Kurt]] in [[Azalea Town]] to capture {{p|Celebi}} in [[Ilex Forest]]. This works in the Japanese, English and European versions of [[Pokémon Crystal Version]].
==Glitch characters==
In [[Generation I]] and [[Generation II]], invalid values being interpreted as text (common in the names of glitch Pokémon and items) can cause portions of graphical assets, such as overworld tiles or HP bars, to be displayed as text.


===Glitch trainers===
==See also==
[[Glitch Trainer|Glitch trainers]] have been known to occur in the Red/Blue/Yellow versions. They are usually found if the player's name contains mostly special characters. There are also several special stat numbers used in the [[Mew glitch]] which cause glitch trainers to appear. Glitch trainers frequently use [[Glitch Pokémon]] in battle.
*[[List of glitches (Generation I)]]
*[[List of glitches (Generation II)]]
*[[List of glitches (Generation III)]]
*[[List of glitches (Generation IV)]]
*[[List of glitches (Generation V)]]
*[[List of glitches (Generation VI)]]
*[[List of glitches (Generation VII)]]
*[[List of glitches (Generation VIII)]]
*[[List of glitches (Generation IX)]]


==Notes== 
{{Glitches}}<br>
* Missingno.'s special stats for the Mew trick vary (see [http://www.trsrockin.com/hexlist.html]).
{{Project Glitchdex notice|no}}
* The Yellow version [[Missingno.]] is different from the Red/Blue Missingno., but both share the same name. For the Yellow version Missingno., using a Pokémon in Method #3 of the [[Mew glitch]] with a special stat of 31, 32, 61, 62 , 63, 67, 68, or 69 would make it appear([http://trsrockin.com/hexlist.html]). Missingno will revert to level 0 if leveled up to over level 255 with Rare Candies or to level 100 if it fights in battle and wins. 
* The Pokémon [['M]], [[3TrainerPoké]], [['M|Charizard 'M]] and [[Q]] are the only known catchable glitch Pokémon that cannot be ''directly'' caught using the Mew glitch. Other glitches can be obtained by messing with the game link cable during a trade. [['M]] and [[3TrainerPoké]] cannot be caught using the [[Mew glitch]] because the special stat required for method #3 of the [[Mew glitch]] is 0, a number which no Pokémon has. [[Charizard 'M]] and [[Q]] cannot because [[Q]] can only be found by evolving a [[44Hy]], and [[Charizard 'M]] can only be found by trading a [[Q]]. The special stat numbers which would cause Charizard 'M or Q to appear in a [[Mew glitch]]-type battle freeze the game. 
* The glitch known as "[[.4]]" can freeze or crash the game if it uses a certain glitch move. If the game is saved while this move is in .4's moveset, the data may be corrupted, making it impossible to continue and forcing the player to start a new game.
* The 24 catchable glitch Pokémon, plus the original 151 Pokémon, brings the total number of catchable Pokémon in the Red/Blue/Yellow versions to 175.
* The characteristics of one Glitch Pokémon usually do not apply to its Red/Blue or Yellow equivalent. For example, [[LM4]] will evolve into {{p|Clefairy}} and then immediately into {{p|Nidoking}}, whereas its Yellow version equivalent, [[7g]], has no evolutions.


==References==
<references/>
{{Glitches}}
[[Category:Game mechanics]]
[[Category:Game mechanics]]
[[Category:Glitches| ]]
[[Category:Glitches|*]]


[[de:Bug]]
[[de:Bug]]
[[es:Glitch]]
[[fr:Bug]]
[[fr:Bug]]
[[it:Glitch]]
[[ja:裏技・バグ一覧]]
[[zh:遊戲漏洞]]

Latest revision as of 03:03, 15 December 2022

Encountering the glitch Pokémon ゥL ゥM 4 by using the Mew glitch

A glitch, also known as bug, is a software error that can lead to unintended behavior in software like the Pokémon games. It can be triggered from mistakes within the game's code or by exploits that were not anticipated by the programmers, thus causing the game to react unexpectedly. Glitches present in Pokémon games can have a variety of effects, such as the disruption of graphics or audio effects, the appearance of glitch Pokémon, the corruption of save data, or a game freeze where the game must be restarted to continue.

When noticed, glitches may be fixed by its developers in later releases of a game or derivative games. In some games, such as Pokémon Ruby and Sapphire and Pokémon X and Y, patches are released that fix glitches in Pokémon games directly.

Glitch Pokémon

Main article: Glitch Pokémon

Glitch Pokémon are caused by glitches that have the game erroneously read placeholder data or non-Pokémon data as Pokémon data. Although many glitch Pokémon draw all their characteristics from data intended to be used elsewhere, some glitch Pokémon may have partially defined characteristics that are not intended to be accessed in-game: for example, in the case of MissingNo., its name is well-defined, but its base stats are read from data intended to represent the parties of several Bikers.

Glitch moves

Main article: Glitch move

A glitch move is a move not intended to be part of the game, but accessible via glitches or cheating devices. While some glitch moves have no effect whatsoever, others may cause the game to freeze when attempting to perform them. Usually, only glitch Pokémon will learn glitch moves.

In Generation I, Ditto can be taught the glitch move -- by a glitch. Additionally, another glitch present in the Time Capsule allows Pokémon that evolve by trading to be taught several glitch moves.

Glitch types

Main article: Glitch type

Glitch types are types that are solely used for glitch Pokémon or glitch moves. The Bird type is a leftover type thought to be a beta version of the Flying-type. All other glitch types are caused by erroneously reading other data as a type. Unlike regular types, glitch types often do not have any weaknesses, resistances, or immunities.

Glitch locations

There are several glitch locations which can only be reached by means of glitches or hacks. One of the most well known glitch locations is Glitch City. Several glitch locations part of the Sevii Islands are retrievable by their index number pointers and do not have any other data; only Sevii Isles 8 and 9 have actual map data. There are also other beta locations such as an unused Safari Zone in Generation II.

Glitch items

Main article: List of unobtainable items

Placeholder items are often intentionally left in the game's code to prevent the game from crashing if the data is accessed, but without the intention to be accessible in-game. Placeholder items, such as the Teru-sama item in Generation II, often appear at the end of the games' internal item lists.

Placeholder items may become regular items in later games of a generation: The GS Ball, Clear Bell, and Egg Ticket, which only appear in Pokémon Crystal, are programmed into the games' internal lists in places of Teru-sama items in Pokémon Gold and Silver; if a corresponding Teru-sama is held by a Pokémon in those games, it will transform when being traded to Crystal.

Glitch items that will become regular items in a later game appear in Generation II and Generation IV. In Generation III, all items introduced in Pokémon FireRed and LeafGreen or Pokémon Emerald are stored in a section of the internal item list that is not accessible in an earlier game. Except for the Griseous Orb (which replaces a glitch item from Pokémon Diamond and Pearl), the same holds for all items introduced in Pokémon Platinum and Pokémon HeartGold and SoulSilver, as well as for all items introduced in games of a later generation.

Glitch Trainers

Main article: Glitch Trainer

Glitch Trainers exist in Generation I and Generation II. They result from the game erroneously reading Trainer or party information from game code that is supposed to contain other information.

Glitch characters

In Generation I and Generation II, invalid values being interpreted as text (common in the names of glitch Pokémon and items) can cause portions of graphical assets, such as overworld tiles or HP bars, to be displayed as text.

See also


Multiple
generations
Transform glitchesGlitch TrainersCloning glitchesError messagesArbitrary code execution
Generation I GlitchesBattle glitchesOverworld glitches
--0 ERRORBroken hidden itemsCable Club escape glitchDual-type damage misinformation
Experience underflow glitchFight Safari Zone Pokémon trickGlitch CityItem duplication glitchItem underflow
Mew glitchOld man glitchPewter Gym skip glitchPokémon merge glitchRhydon glitchRival twins glitch
Select glitches (dokokashira door glitch, second type glitch) • Super Glitch
Time Capsule exploitWalking through wallsZZAZZ glitch
Generation II GlitchesBattle glitches
Bug-Catching Contest glitchCelebi Egg glitchCoin Case glitchesExperience underflow glitch
Glitch dimensionGlitch EggTeru-samaTime Capsule exploitTrainer House glitchesGS Ball mail glitch
Generation III GlitchesBattle glitches
Berry glitchDive glitchPomeg glitchGlitzer Popping
Generation IV GlitchesBattle glitchesOverworld glitches
Acid rainGTS glitchesPomeg glitchRage glitch
Surf glitchTweakingPal Park Retire glitch
Generation V GlitchesBattle glitchesOverworld glitches
Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Frozen Zoroark glitchSky Drop glitch
Generation VI GlitchesBattle glitchesOverworld glitches
Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Lumiose City save glitchSymbiosis Eject Button glitchToxic sure-hit glitch
Generation VII GlitchesBattle glitches
Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Toxic sure-hit glitchRollout storage glitch
Generation VIII Glitches
Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Toxic sure-hit glitchRollout storage glitchParty item offset glitch
Generation IX Glitches
Glitch effects Game freezeGlitch battleGlitch song
Gen I only: Glitch screenTMTRAINER effectInverted sprites
Gen II only: Glitch dimension
Lists Glitches (GOMystery DungeonTCG GBSpin-off)
Glitch Pokémon (Gen IGen IIGen IIIGen IVGen VGen VIGen VIIGen VIII)
Glitch moves (Gen I) • Glitch types (Gen IGen II)


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