The Aggronite (Japanese: ボスゴドラナイト Bossgodoranite) is a type of held item introduced in Generation VI. It is a Mega Stone associated with Aggron.
If held by an Aggron, allows it to Mega Evolve into Mega Aggron 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 Aggron a Aggronite or remove a Aggronite from Aggron.
If held by an Aggron, allows it to Mega Evolve into Mega Aggron when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Aggron will remain a Mega Aggron until the Talent Round ends.