Glitch City Laboratories Archives

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????? (FC)Generation II glitch Egg (Gold/Silver) (FD)????? (FE)
Please note that some of the data described here may not be fully reliable if it depends on the contents of writable memory, such as RAM; WRAM; SRAM.


More research is needed for this article.

Reason given: Document more effects of it. Can a Glitch Pokémon evolve if its sprite and name are "stable" enough? Are there many glitch cries available for Glitch Pokémon? List Glitch Type Sprites that could cause interesting effects. Study the causes and effects of the corruption of the PC Pokémon Selection in Fr/Lg. Test again the effect of Pokédex entries of Glitch Pokémon.

; when specified as an Egg that hatches from itself, or when the game attempts to load data for Pokémon 253 is glitch Pokémon in Pokémon Gold.

When faces a wild Pokémon, its typing will change to that of the wild Pokémon.

When faces a Trainer, its typing will change to that of the first Pokémon sent out.

Similarly, the typing and base stats of an opposing wild Egg are taken from the first Pokémon sent out by the user in a wild battle, or a Pokémon that was out before the wild Egg was sent out in a Trainer battle.

For unknown reasons, encountering a wild Egg may corrupt the graphics that relate to how many Poké Balls (party members) the player has.

This effect on the player's Poké Ball graphics does not seem to apply when encountering a Trainer House Trainer with an Egg in their party, however.


In Pokémon Gold

Attempting to load 's backsprite may cause the game to freeze. After the freeze, if a save file exists then the player's Mail Box may become corrupted, adding many glitch mail signed by GREEN.

The opponent in the Trainer House may also be replaced with a blank name glitch trainer.

In Pokémon Silver

's backsprite is different to Pokémon Gold and does not freeze the game.


By level up

(No known moves)


(No known moves)

Base stats


Pokédex entry

This glitch Pokémon's Pokédex entry may result in a Glitch Dimension.

Type effectiveness



(None known)

Methods to obtain

  • Byte shifting via (00) or (FF) (available through stabilizing a bad clone or arbitrary code execution) (e.g. byte shift a total experience of 253 or 64768-65023 and then stabilize the glitch Pokémon at the Day Care); unconfirmed.
  • ????? party overloading roaming Pokémon manipulation (253 Attack. If Egg's capture flag was set after the party overloading, it can be caught with no issues).
  • Arbitrary code execution (e.g. through Coin Case arbitrary code execution, wrong pocket TMs, glitch Pokédex categories).


    's Pokédex entry may freeze the game sometimes, and not freeze the game at other times.