How to get Gengar in Pokémon FireRed - Quora

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Pokémon FireRed and LeafGreen/Celadon City — StrategyWiki

Fly, Pokémon Wiki

Apparently, in Pokémon Gaia, Raichu can learn Fly : r/PokemonROMhacks

Pokemon Fire Red cheats, full list of codes and how to use them