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

Pokémon FireRed: A Step By Step Guide To Getting Fly

How to Get Good Pokémon in Fire Red: 4 Steps (with Pictures)

FireRed LeafGreen Community Tier List Day 9! Today is our biggest post yet: We're covering Pokemon Tower, the Eeveelutions, and routes near Celadon. So we're ranking Haunter, Gengar, Marowak, Vaporeon, Jolteon, Flareon

Pokémon Fire Red Version And Leaf Green Version ( Prima Official Game Guide 2004) : Free Download, Borrow, and Streaming : Internet Archive

Butterfree generation 3 move learnset (Ruby, Sapphire, FireRed, LeafGreen, Emerald)

Pokémon FireRed and LeafGreen/Safari Zone — StrategyWiki

Best Pokemon Fire Red: Cheats, Codes in 2020 [100% Working]

First Playthrough! Trying to learn pokemon types and weaknesses still lol.

The Most Common Hall of Famers In Pokémon FireRed & LeafGreen From The Last 6 Months : r/nuzlocke

How to Beat Vermillion City's Gym Leader in Pokémon FireRed and LeafGreen - Master Noobs