The Aerodactylite (Japanese: プテラナイト Pteranite) is a type of held item introduced in Generation VI. It is a Mega Stone associated with Aerodactyl.
If held by an Aerodactyl (or is present in the player's Bag)PE, allows it to Mega Evolve into Mega Aerodactyl 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 Aerodactyl an Aerodactylite or remove an Aerodactylite from Aerodactyl.
If held by an Aerodactyl, allows it to Mega Evolve into Mega Aerodactyl when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Aerodactyl will remain a Mega Aerodactyl until the Talent Round ends.