Key Stone
Allows the player’s Pokémon to Mega Evolve.
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3 gamesA stone filled with an unexplained power. It reacts to Mega Stones and makes Pokémon Mega Evolve.
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“Key Stone”. Pokémonism. Retrieved [date] from pokemonism.com/items/key-stone.
Item data from PokéAPI, PKHeX and Serebii.