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A Pokémon that evolves by an evolutionary stone, such as Clefairy, Staryu, or Pikachu, as the first Pokemon in your party. One of the following Pokemon, each one of which corresponds to an evolution stone, in your party. Exeggutor - Moon Stone HEX 20 Missingno. - Fire Stone Psyduck - Leaf Stone Growlithe - Thunderstone Onix - Water Stone
The player has to get into a Trainer battle. Have the first Pokémon in the player's party, the one he or she is trying to evolve, gain a level. Switch out the Pokémon that the player is trying to evolve and put the Pokémon that corresponds to the necessary evolution stone. Have that Pokémon finish the Trainer battle.
Additional informationThis glitch can also be done when encountering a wild Pokémon. Have the Pokémon you're trying to evolve start the battle and then change Pokémon and place the Pokémon that corresponds to the required evolution stone in battle. Have the Pokémon end the battle. Both Pokémon will gain experience and for the glitch to work, the Pokémon the player is trying to evolve will need to gain a level from the experience it gains.
Evolving glitch Pokémon with this glitch
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.
Certain glitch Pokémon evolve by "exposure to an item" that isn't an evolutionary stone. Others may evolve with a valid stone, but only through this glitch and not through the actual item. An example is the glitch Pokémon O PkMn4 X, which can evolve at level 6 or more when using this glitch with Exeggutor (corresponding to Moon Stone).
The reason why the actual item won't work is that when evolving a Pokémon using an evolutionary stone or by trade, a flag is set to suppress evolution through level (and also to disallow the player to cancel the evolution by pressing B). When that flag is set, and when the game sees any entry in the evolution table that isn't "by item" or "by trade", it will immediately stop scanning through the table. For glitch Pokémon, their evolution table usually have several invalid entries before any valid entry, making evolution using an evolutionary stone or by trade impossible.
Here is a list of glitch Pokémon stone or item evolutions by echinodermata. Note that the data was taken from the ROM, so there may be some evolutions that do not work.
The reason this glitch occurs is because the game uses the same memory address to detect whether an item is used or whether a Pokémon is in battle.
The memory address is CF91. Use a Fire Stone outside of battle, and this variable is filled briefly by hex:20. Enter a battle, and send out a hex:20 Missingno., and the variable will become hex:20.