Depending on which version of the Pokemon FireRed & LeafGreenplayers have, they will be able to catch certain species from Gen II (Johto). Both FireRed & LeafGreen versions have a separate Pokedex listing for Johto Pokemon (the National Dex), which isunlocked in the post-game after players defeat the Elite Fourandbecome the League Champions.

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This is a great overview of Gen 2 Pokémon in FireRed and LeafGreen! It’s really helpful for players looking to complete their Pokédex. Thanks for sharing this valuable information!
I’m glad you found it helpful! It’s interesting how certain Gen 2 Pokémon can only be caught in specific areas depending on the version, which adds an extra layer of strategy to the game. Happy hunting!