Fossil conversion glitch (Japanese)

Major glitches of the Pokémon series

No further extensions

Transform held item glitch (Generation IV, Japan only) | Mimic glitch (Generation IV, Japan only)

Buffer overflow techniques

Item stack duplication glitch (Generation I)

Generation I expanded items pack (Glitch Rocket HQ maps, Map FE (English and non-English European Yellow) | Map script pointer manipulation (arbitrary code execution | Map script pointer item ball manipulation) | Text pointer manipulation (arbitrary code execution | Item ball manipulation | Mart buffer overflow) | Trainerless instant encounter glitch

Bad clone glitch (Generation II)

Closed menu Select glitches (Japanese Red/Green)

Pomeg glitch (Generation III)

Pomeg data corruption glitch ("Glitzer Popping") | Charm glitch

Voiding (Generation IV)

Tweaking

Broken escalator glitch (Japan only) | Elite Four door glitch (Japan only)

2x2 block encounter glitches (Generation I)

Left-facing shore tile glitch (in-game trade shore encounter trick, Old man trick, Trade link up shore encounter trick, Fight Safari Zone Pokémon trick) | Viridian Forest no encounter grass tiles glitch

Glitch City

Safari Zone exit glitch | RAM manipulation | Out of bounds Glitch City (Generation II) | Slowpoke Well out of bounds corruption (French Gold/Silver/Crystal)

Large storage box byte shift glitch

Storage box remaining HP glitch | Generation I max stat trick

Pikachu off-screen glitch

Trainer corruption glitch

SRAM glitches

Trainer escape glitch

Walk through walls

Ledge method | Museum guy method | Rival's effect | Select glitch method (International Select glitch method), Brock Through Walls

Surf down glitch

Grass/rock Surfing glitch (Spanish/Italian only) (adaptions: Submerge glitch (international)) | 8 8 (0x7C) grass/rock surfing glitch (English Red/Blue))

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The fossil conversion glitch is a variation of many Japanese exclusive glitches, known as select bugs on Pokémon Red and Green. It was presumably first documented on the Japanese Pokémon glitch website Pokemonbug.oh.land.to

Please note that this glitch only exists in the Japanese versions of the game, or is otherwise a glitch
from a Pokémon game which was only released in Japan.

File:Convertfossil.png

A player recieving a glitch Pokémon in the Japanese version of Pokémon Red, after performing the fossil conversion glitch.

This glitch allows the player to change the identifier of an original legitimate fossil Pokémon such as Kabuto or Omanyte and change it to another Pokémon. As a result, all legitimate Pokémon are obtainable through this glitch, as well as any glitch Pokémon on Pokémon Red and Green.

Explanation

This glitch involves the player using select to switch the 32nd item (13th in his or her PC) with the fifth Pokémon in the party. In the data structure of the Generation I Pokémon games any data for an interface outside of the normal range such as a 'seventh Pokémon' in the party will actually correspond to other data within the game. When the player is switching an item with a Pokémon he or she is essentially switching the information of other 'cHunks' of data in the game because the game will attempt to manage a Pokémon with the data of an item (i.e. one past how many Pokémon the player has).

This glitch is an example of one of these select bugs and switches the data of the fossil Pokémon with another value, based on what item was switched from the 32nd item slot. None of these glitches exist in the English versions of the games because the feature to switch Pokémon with the select button was removed.

Requirements

The player requires either a Helix Fossil or a Dome Fossil in his or her bag.
The player needs access to at least Cinnibar Island
The player needs at least five Pokémon in his or her party.
The player needs at least 13 items in his or her PC.
The data of the fifth Pokémon will be corrupted, so to eliminate any side-effects of the glitch it is reccommended that it is not valuable.

Method

Presuming that the player has at least five Pokémon in the party and a thirteenth item in the PC, he or she should go to the fossil scientist in Cinnibar Island and ressurect any fossil.
Before returning to obtain the original fossil Pokémon, the player should to the Pokémon Center and access his or her PC.
The player should use the select button on his or her 13th item in the PC and then exit using the Cancel option.
The player should encounter a Pokémon in the Cinnibar Mansion (if he or she uses a Rod or the move Surf the select button will have been deselected).
Within the battle, the player should go to the Pokémon screen and select the fifth Pokémon.
After choosing the 'RUN' option, if the player returns to the scientist and recieves his or her Pokémon it will be recieved as another Pokémon (depending on the identifier of the 13th item in the PC.)

External links

[1] - A step by step guide of the fossil conversion glitch for Pokémon Red and Green in Japanese.