Mega Evolution, Fakemon FireRed Wikia

Mega Evolution in Fakemon FireRed works by having the Key Stone in your inventory, giving a Fakemon its corresponding Mega Stone to hold, and then pressing "Start" in battle before choosing a move. This page lists all the different Fakemon that are able to Mega Evolve, their typing and abilities, and where their Mega Stone can be found. Every Mega Stone should be available before the E4.

Fossil - Bulbapedia, the community-driven Pokémon encyclopedia

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