If held by a Pinsir (or is present in the player's Bag)PE, allows it to Mega Evolve into Mega Pinsir if its Trainer has a Key Stone. Each Trainer can only Mega Evolve one Pokémon per battle.
Unaffected by item negating effects (such as Embargo and Klutz). Item manipulating effects (such as Trick and Fling) cannot give Pinsir a Pinsirite or remove a Pinsirite from Pinsir.
Outside of battle
If held by a Pinsir, allows it to Mega Evolve into Mega Pinsir when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Pinsir will remain a Mega Pinsir until the Talent Round ends.
Erases Pokémon and disruptions around two spots you tap. Erases five tiles in a + shape surrounding each spot. Does not activate if the foe is defeated. Only gives 3 seconds to tap. Can erase fewer than 2.