This glitch allows the player to give nearly any attack to any Pokémon without the use of a cheating device. The Pokémon merge glitch can also make a Pokémon have the stats and type of another Pokémon.
1. Deposit any Pokémon into an empty box.
2. Deposit 'M (FF) or Q.
2. Deposit a Pokémon below the 'M (FF) or Q (e.g. Charmander). This will be the 'donor' Pokémon for the unstable hybrid Pokémon.
3. Deposit a Pokémon below the third Pokémon (e.g. Staryu). This will be the 'recipient' Pokémon for the unstable hybrid Pokémon.
4. Withdraw the first Pokémon in the box.
In this example, the Pokémon merge glitch will have created both a 'M (FF) or Q/Charmander hybrid and Charmander/Staryu hybrid.
The "Charmander" will have Staryu's name, moves and palette but will be able to learn moves a Charmander would be able to by TM/HM.
It can be stabilized into a Charmeleon through evolution, or back into a Staryu either by depositing it into the Pokémon Day Care and out again or taking the Pokémon into Pokémon Stadium 2 (English). It cannot be traded into Pokémon Gold, Silver and Crystal until it is stabilized.
Since the hybrid's DVs will be those of the recipient Pokémon, it is possible for the player to create a new Shiny Pokémon. It can be stabilized by evolving the end result unstable hybrid. For example, if the Staryu mentioned in the section above was originally Shiny, the Charmander/Staryu hybrid may be evolved to become a stable Shiny Charmeleon.
The player should have a party of six Pokémon; and then bring the ????? (FF) to the top of the party. They should then use 'move PkMn without Mail' to bring another Pokémon to the top. This will convert the ????? (00) into a ????? (FF).
The player should set up a party like so:
Upon depositing Pokémon 1 or 2, the Pokémon below ????? (FF) will hybridize. Caterpie will become a ????? (FF)/Caterpie hybrid, Shiny Gyarados will become a Caterpie/Gyarados hybrid (which can be evolved to become a stable Shiny Metapod) and Growlithe will become a Shiny Gyarados/Growlithe hybrid (which can be taught water moves and taken into the Day Care and out again to revert back into a stable Growlithe).