List of glitches in Generation I

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Revision as of 03:40, 23 September 2012 by Blaziken257 (talk | contribs) (Added video showing this glitch (and variations of it))
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This is a list of glitches that occur in the Generation I main series Pokémon games.

In Pokémon Red and Green

Dokokashira door glitch

Main article: Dokokashira door glitch

Prevented progress

If the player's starter Pokémon evolves before they obtain their Pokédex from Prof. Oak, the game will assume, since they have 2 Pokémon registered as caught, that they already have a Pokédex, and will not allow them to proceed. This glitch is only present in the Japanese Pokémon Red and Green.

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

Second type glitch

Main article: Second type glitch

In Pokémon Red and Blue

Item duplication glitch

Main article: Item duplication glitch

Lift Key glitch

The Lift Key glitch

In the Rocket Hideout, if the player is standing to the left of the Team Rocket Grunt who has the Lift Key and talks to him, the Lift Key will appear underneath the player when he drops it. The player can still move around and collect it if he moves downward.

This glitch was fixed in Pokémon Yellow, FireRed and LeafGreen due to the Grunt automatically dropping the Lift Key as soon as he is defeated.

Man on roof

If the player does not have the Secret Key to the Cinnabar Gym, and surfs on the east coast and returns to land directly in front of the Gym, a man will appear on the roof of the Gym.

A similar effect happens if the player walks into the Vermilion Gym, walks directly left and then up so that they are facing the bottom-left trash can and press A to inspect it, or if the player is in the gate to Cycling Road. One of the Trainers in the Gym will be misplaced and return to his usual spot once the text box disappears, and when in the gate there may be a man standing on an object somewhere behind the guard.

Both of these variations of this glitch were fixed in some European versions of Red and Blue, such as the Spanish version, as well as all versions of Yellow.

By Blaziken257
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

Old man glitch

Main article: Old man glitch

Pewter Gym skip

This glitch occurs in Pokémon Red and Blue. It allows the player to enter Route 3 without defeating Brock at Pewter Gym and earning the Boulder Badge. There are two ways to perform this glitch. Both of these variations were fixed in the Spanish (and possibly other European) versions of Red and Blue.

Walking directly in front of the Youngster

To perform the glitch, the player must first open the menu and move the cursor to "Save" without selecting it. Then the player must walk on the tile in front of the Youngster at the east exit of Pewter City and close the dialogs with the B-button (not the A-button), then immediately press Start and save the game (the cursor is frozen). The player must then reset the game. The conversation will happen again, and the player will then be forced to follow him. After that, the Youngster will be gone, and the player can walk across where the Youngster used to stand to enter Route 3.

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

Walking a tile away from the Youngster

To perform the glitch, the player must first open the menu and move the cursor to "Save" without selecting it. Then the player must walk past the Youngster at the east exit of Pewter City, leaving at least one empty tile between them, which will allow the player to walk two tiles past the Youngster. The player must then close the dialogs with the B-button (not the A-button), then immediately press Start and save the game (the cursor is frozen). The player must then reset the game. The conversation will happen again, but the player will not be forced to follow him. The player can continue walking along Route 3, but if the player walks into the Youngster's line of sight from the east, they will walk down infinitely.

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

In all Generation I games


Main article: -- (move)

If a Ditto transforms into another Pokémon and then switches around the copied moves with the Select button, after the battle the Ditto will not have transform and will instead have --.


Main article: 0 ERROR

A glitch similar to the Mew glitch that causes Route 6 to become glitched.

0 PP glitch

In Generation I, struggling can be avoided by allowing the game to self-select a move to be used, which can happen to any move used immediately after a Pokémon is defrosted, or due to a handful of moves' effects (Bind, Clamp, Fire Spin, Hyper Beam, Metronome, Mimic, and Wrap) because of the auto-selection involved with partial-trapping moves. A move used with 0 PP in this way would underflow to the maximum possible value, 63 PP, and, due to the way the data is structured, a move that 0 PP Ups had been used on would gain full PP Up status, while those on which PP Ups had been used would lose one PP Up boost. This glitch was addressed in Generation II games and later, which prevent a move from being executed if it has 0 PP.

Cable Club escape glitch

Main article: Cable Club escape glitch

Critical hit ratio boost glitch

Focus Energy and Dire Hit were intended to quadruple the critical hit rate, but due to a glitch, they instead have no effect if the user is faster than the opponent, or prevent the user from getting a critical hit (0/511 chance) if the user is slower than the opponent. [1] [2] This was fixed in Pokémon Stadium.

Cut glitch

Main article: Cut glitch

Cycling Road glitch

If the player does not have a Bicycle (or it has been deposited in the PC), it is still possible to reach Cycling Road by holding down the left button while the guard attempts to prevent the player from entering the Cycling Road. Upon entering Cycling Road, the player will be automatically riding a bike, despite not having one.

Deposit glitch

It is possible for the player to deposit all Pokémon except fainted ones and a black out will occur but only after four steps in the same session. In Red and Blue it is possible to progress further by saving the game before traveling four steps to reset the 'remaining step count' to 4 when the game is reset, though this is no longer the case in Pokémon Yellow because the remaining step count was changed to default to 1 step. The player immediately has a black out if entering a battle with just fainted Pokémon.

Draw audio glitch

Prior to Generation II, having the player character draw in a Pokémon battle causes the victory theme to play even though the player has lost.

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

Dual-typed Pokémon glitch

In Generation I, Pokémon with two types that have a weakness and resistance to the same type receive neutral damage from that type, but the incorrect message is displayed.

For example, Grass-type moves do neutral damage to Gyarados, but if Gyarados is hit by a Grass-type move, the game erroneously states that the attack is "not very effective...".

The game prioritizes on which message to display for each 'special' scenario (where normal damage is not dealt) based on each scenario's internal ordering. The higher the ordering determines what message the game will display. Grass against Water as 200% damage for instance is the 4th entry, whilst Grass against Flying as 50% damage is the 27th. Consequently in this example the game chooses the message for scenario #27, returning the wrong message "It's not very effective...".

This glitch does not occur in Pokémon Stadium.

If an attack is super effective or not very effective against one type and does no damage against another type (for example, Dig against Charizard), the game will erroneously state that the attack missed.

Order of priority of messages

Messages higher on the list take priority to those lower on the list. This list is the reverse order to which they are stored in the game data, which is likely the order they were added to the game.

Attacking type Effectiveness Defending type
Dragon Dragon
Ice Dragon
Grass ½× Dragon
Electric ½× Dragon
Water ½× Dragon
Fire ½× Dragon
Ghost Psychic
Ghost Normal
Rock Ice
Rock Bug
Rock Flying
Rock ½× Ground
Rock ½× Fighting
Rock Fire
Bug Poison
Bug ½× Ghost
Bug Psychic
Bug ½× Flying
Bug ½× Fighting
Bug Grass
Bug ½× Fire
Psychic Poison
Psychic Fighting
Flying ½× Rock
Flying Grass
Flying Bug
Flying Fighting
Flying ½× Electric
Ground Poison
Ground Rock
Ground ½× Bug
Ground ½× Grass
Ground Electric
Ground Fire
Poison ½× Ghost
Poison ½× Rock
Poison Bug
Poison ½× Ground
Poison ½× Poison
Poison Grass
Fighting Ghost
Fighting Ice
Fighting Rock
Fighting ½× Bug
Fighting ½× Psychic
Fighting ½× Flying
Fighting ½× Poison
Fighting Normal
Ice Flying
Ice Ground
Ice Grass
Ice ½× Water
Grass ½× Flying
Grass Rock
Grass ½× Poison
Grass ½× Flying
Grass Ground
Electric Flying
Electric Ground
Water Ground
Fire ½× Rock
Fire Bug
Ghost Ghost
Normal Ghost
Normal ½× Rock
Electric ½× Grass
Water ½× Grass
Grass ½× Fire
Fire ½× Water
Psychic ½× Psychic
Grass ½× Grass
Ice ½× Ice
Electric ½× Electric
Fire ½× Fire
Water ½× Water
Ground Flying
Water Rock
Electric Water
Grass Water
Fire Ice
Fire Grass
Water Fire

Error codes

Main article: Error codes

Evolutionary stone glitch

BoEANSprite.png This glitch is in need of research.
Reason: Glitch Pokémon which evolve by items
You can discuss this on the talk page.

Pokémon can be evolved without the use of an evolutionary stone, provided that the player has sent out a Pokémon with the equivalent identifier of the relevant evolutionary stone item and finishes the battle with that Pokémon in the same battle that a Pokémon that evolves using an evolutionary stone levels up.

Much as the starter Pikachu from Pokémon Yellow will refuse to evolve if a Thunderstone is used on it while in the game it is the starter of, leveling up Pikachu and switching to Growlithe will not cause it to evolve, though outsider Pikachu and Eevee will all do so the same as in Red and Blue.

Some glitch Pokémon with unusual evolutionary flags may evolve this way according to the game 'after exposure to an item', which is not necessarily an evolutionary stone.

Pokémon Stone
Exeggutor Moon Stone
Missingno.* Fire Stone
Psyduck Leaf Stone
Growlithe Thunderstone
Onix Water Stone
By v0id19
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

Experience underflow glitch

Main article: Experience#Experience underflow glitch

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 low amount of experience points.

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

Fishing in statues

The player can use a Fishing rod when facing the right or left of a gym statue. It will always say "Looks like there's nothing in here...", except in the Cerulean Gym, where all the Pokémon obtainable in the Gym can be caught. The player is also able to surf on these statues.

Gate glitch

Certain gates which can be accessed after the player passes Cycling Road will have guards that restrict the player from passing if the Bicycle is deposited in the PC, even though the player does not require a Bicycle.

Ghost glitch

When encountering a ghost in Pokémon Tower without having a Silph Scope, it is possible to see its true identity by viewing the stats of any Pokémon in the player's party. However, this glitch is only graphical, and it is still impossible to fight or catch it.

Ghost Marowak glitch

Using a Poké Doll on the ghost Marowak in Pokémon Tower with or without the Silph Scope will cause it to permanently disappear.

Glitch City

Main article: Glitch City

Hall of Fame glitch

Some corrupted Hall of Fame entries
Main article: Missingno.#Glitches caused

When glitch Pokémon have been seen on the save file, the player's Hall of Fame is badly corrupted with entirely different Pokémon, even glitch Pokémon, and very glitched characters, names and levels. This does not affect the Pokémon themselves, rather the data seen in the Hall of Fame.

Haze glitch

If Haze is used to thaw a frozen Pokémon when it still needs to recharge from Hyper Beam, the Pokémon will thaw out but it will be unable to make a move until it faints even if a Fire type move is used later. This glitch was fixed in Pokémon Stadium. It is similar to the Sky Drop glitch in Generation V, because both glitches permanently make the opponent unable to move until fainting or switching (although switching out the Pokémon is normally not possible).

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

(Glitch starts at 1:56)

Index 000 post-capture

In Generation I, if the player manages to capture an 'M (00), an invisible wild Ditto will still be in battle with the player where 'M (00) was before, and the battle will not end. This Ditto can then be caught.

Invisible tree

Main article: Cut glitch#Invisible tree

There is a tree near the bottom of Route 14. If this particular tree is cut down and then the player walks five steps west from where the tree was (so that the spot where the tree used to be is at the edge of the screen) and then walks back their path will be blocked as if a tree was still there. Even though the tree is not visible, it can still be cut down normally using the move Cut.

Invisible PC

In Generation I, there is an invisible PC in the hotel in Celadon City. This fact is explained by the close resemblance between the hotel and a Pokémon Center. This was less a glitch, and more likely an oversight by the programmers, who may have forgotten to remove the code to activate the PC at that particular point, though the sprite of the PC itself is no longer there. It is possible to walk on the tile where the PC is. This glitch was fixed in Pokémon Yellow.

By Gligar13Vids
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

Landing on an NPC

If the player lures an NPC below a ledge that can be jumped over, it is possible to land on top of the NPC.

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

Leech Seed and Toxic stacking

If the target of Leech Seed is also under the effect of Toxic, Leech Seed damage will increase every turn as the N value of Toxic increases because Leech Seed and Toxic both use the same damage algorithm (N * max(1, int(0.0625*MaxHP). This was fixed as of Generation II. If the current HP of the recipient of Leech Seed's HP-restoring effect is greater than its maximum HP, its current HP will be set equal to its maximum HP.

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

Level-up moves glitch

Pokémon cannot learn moves they should learn at a level if they earn enough experience at once to skip that level.

For example, if a level 6 Bulbasaur earned enough experience points for defeating a single Pokémon to reach level 8, it will not learn Leech Seed, a move it would normally learn at level 7.

Leveling past 100

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.

Mew glitch

Main article: Mew glitch

Pokémon merge glitch

Main article: Pokémon merge glitch

Pokémon storage system cloning

Main article: Cloning glitches#Storage system method

Rhydon glitch

Main article: Rhydon glitch

Save Surf glitch

The glitch is performed by standing next to a water tile that is facing up, left, or right, walk in that direction and pressing start without letting go of the D-Pad. The game then needs to be saved and reset. When loading the saved data, the player will be facing in the direction that was being held down when the start button was pressed. Using Surf will cause the player to surf on the tile immediately south, even if it is not a water tile.

When loading a saved file, the player usually starts facing south. This is because of the limited data in the game. This glitch causes the player to face in a different direction, which confuses the game.

Selfdestruct/Explosion and Substitute glitch

In Red, Blue, and Yellow using a sacrificial move like Explosion on a Substitute and having the damage break the Substitute prevents the user from fainting. The sprite of the user vanishes regardless.

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

Silent Indigo Plateau glitch

In the battle against Blue at Indigo Plateau, if the player evolves a Pokémon in battle and defeats Blue, the music will be muted until Professor Oak comes to congratulate the player.

(Video comparing the battle where a Caterpie evolves, to the same battle where no Pokémon evolves):

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

Sprite glitch

The sprite glitch as seen in Generation I games, in this case triggered by the encounter of ♀ .

The sprite glitch is a glitch that alters the appearance of the sprites in Generation I, making the sprites appear to be cut into pieces or even unrecognizable in some instances.

In Generation I, many glitch Pokémon will distort battle sprites upon their encounter; however, this can be fixed by viewing the stats of a non-glitched Pokémon. There are other methods to the glitch, some of which involve using a Pokémon Center to heal the player's Pokémon when in a glitched area, visiting Glitch City, or catching certain glitch Pokémon.

In other generations, it may occur when a cheating device is used.

Standing on a tree

Red standing on top of the tree outside Vermilion Gym
Main article: Cut glitch#Standing on a tree

In Generation I, if the player cuts down a tree, stands on the spot where the object was, saves, turns the game off, then loads it, the player will be standing on the tree. It is no longer possible to stand on a tree in later generations, nor is it possible to stand on a boulder.

This glitch occurs because the Generation I engine would not store the data needed to remember that the tree had been cleared. Generation II does not remember this data either, but is not susceptible to the glitch.

Stuck in a wall

If the player lures an NPC into the grass above Pallet Town, she will block the player from following Professor Oak correctly, causing the player to become stuck in the wall of Oak's laboratory.

Trade cloning

Main article: Cloning glitches#Trading method

Transform assumption glitch

In Generation I and II, 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 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.

ZZAZZ glitch

Main article: ZZAZZ glitch

Glitches involving communication with the Generation II games

Johto guard glitch

Main article: Johto guard glitch

Shiny Ditto glitch

The Shiny Ditto glitch requires a game from Generation I and Generation II, but only has an effect on a Generation II game. By trading any Shiny Pokémon to a Generation I game, having a wild Ditto transform into that Pokémon, then catching and trading the Ditto into a Generation II game, the Ditto will be Shiny.

Trade evolution glitch

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 Graveler from Pokémon Red to Pokémon Gold will make the Graveler evolve into Golem. Since it is level 34, it will learn 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 TM05.


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 glitch
Generation VI: Lumiose City save glitchSymbiosis Eject Button glitch
Generation VII:
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.