If held by a Salamence, allows it to Mega Evolve into Mega Salamence 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 Salamence a Salamencite or remove a Salamencite from Salamence.
Outside of battle
If held by a Salamence, allows it to Mega Evolve into Mega Salamence when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Salamence will remain a Mega Salamence until the Talent Round ends.
The player can obtain the Salamencite by defeating Mega Salamence in Stage 530 found on Nacht Carnival.
The Salamencite was also available as a prize during the Mega Salamence Competitive Stage. This Competitive Stage ran on both the Nintendo 3DS and Mobile versions from January 16 to 23, 2018.
The Salamencite enables the following Mega Evolution: