In the core series games
If held by a Sableye, allows it to Mega Evolve into Mega Sableye 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 Sableye a Sablenite or remove a Sablenite from Sableye.
Outside of battle
If held by a Sableye, allows it to Mega Evolve into Mega Sableye when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Sableye will remain a Mega Sableye until the Talent Round ends.
Pokémon holding Sablenite in Pokémon Omega Ruby and Alpha Sapphire cannot be traded to Pokémon X and Y.
|One of a variety of mysterious Mega Stones. Have Sableye hold it, and this stone will enable it to Mega Evolve during battle.
In spin-off games
In other languages