Mega Evolution, Pokémon GO Wiki

Mega Evolution is an additional, temporary evolution form of specific Pokémon that reached their final evolution stage. They have greatly increased Combat Power, but their HP remains the same. Certain Pokémon may also change their types after being Mega Evolved. Similarly to the main series games, Mega Evolution is temporary, however in Pokémon GO it is a temporal change of form that occurs in Trainer's Pokémon collection instead of a single battle. Mega Evolved Pokémon can be assigned as a Budd

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