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First introduced in Pokémon X and Y, certain Pokémon are capable of Mega Evolving during battle. Similar to normal evolution, they can benefit from increased stats and even a different Type combination. However, Mega Evolution isn’t permanent and the effects disappear after the battle–or if the Pokémon is KO’d.

To Mega Evolve, you need two things. First, you need a Key Stone, which is given to you before you challenge the eighth Gym. Next, you need the corresponding Mega Stone for your Pokémon. You get the Mega Stones for the original Kanto starters at the same time as the Key Stone, while the rest are relegated to the post-game.

If a Pokémon is capable of Mega Evolving–and once the conditions have been met, you can Mega Evolve by selecting the command to the left of a Pokémon’s moves, and then choosing a move as normal. Afterwards, the Pokémon will Mega Evolve as the turn begins, and use their move when it’s their turn.

Applicable Pokémon¶

Pokémon	Mega Evolution Benefits	Mega Stone Location
Venusaur	Increased offence and bulk.	From Blue before the eighth Gym.
Charizard	X: Gains Dragon-type and increased offence. Y: Increased special stats.	From Blue before the eighth Gym.
Blastoise	Increased offence and bulk.	From Blue before the eighth Gym.
Beedrill	Massively increased Attack and Speed.	Indigo Plateau when Champion.
Pidgeot	Massively increased Special Attack.	Indigo Plateau when Champion.
Alakazam	Increased Special Attack and Speed.	Indigo Plateau when Champion.
Slowbro	Massively increased Defence.	Indigo Plateau when Champion.
Gengar	Increased Special Attack and Speed.	Indigo Plateau when Champion.
Kangaskhan	Increased offence and bulk.	Indigo Plateau when Champion.
Pinsir	Gains Flying-type and increased Attack and Speed.	Indigo Plateau when Champion.
Gyarados	Flying replaced with Dark and gains Attack and bulk.	Indigo Plateau when Champion.
Aerodactyl	Increased Attack and Speed.	Indigo Plateau when Champion.
Mewtwo	X: Gains Fighting-type and massively increased Attack. Y: Massively increased Special Attack.	From Green in Cerulean Cave.