Mega Stones cannot be activated for Pokémon that have transformed into their corresponding Pokémon (either by Transform or Imposter).Īs held items, Mega Stones cannot be transfered to or from their corresponding Pokémon in battle Thief and Covet will not steal them, Knock Off will not remove them or cause extra damage, Trick, Switcheroo, Fling, and Bestow will fail, and Symbiosis will not activate. Mega Stones are not consumed upon use, but only one Mega Stone use is possible per Trainer per battle. The Pokémon's Trainer can use their Key Stone to activate the Mega Stone at the start of a turn, causing the Pokémon to undergo Mega Evolution. The stone must be held by the Pokémon or, in Let's Go, Pikachu! and Let's Go, Eevee! (which do not feature held items), be in the possession of the Pokémon's Trainer. 4.2.2 Omega Ruby & Alpha Sapphire chapterĭuring battle, a Mega Stone can be activated while its corresponding Pokémon is on the field.4.1 Pokémon - The Legend of the Dragon King.2.2.2.2 Let's Go, Pikachu! and Let's Go, Eevee!.2.2.2.1 Sun, Moon, Ultra Sun, and Ultra Moon.Pokémon Brilliant Diamond and Shining Pearl.

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