Altering Cave - Pokemon Fire Red and Leaf Green Guide - IGN

Found north of Sixth Island, this cave only have Zubats. However, if you have an E-reader connected to a gameboy advance using Japanese E-reader cards

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Pokémon FireRed and LeafGreen/Six Island — StrategyWiki

Altering Cave - Pokémon FireRed #49

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PK3/WC3: Unreleased Altering Cave Pokémon - Unreleased/Beta PKM

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