If held by aCharizard (or is present in theplayer'sBagPE), the Charizardite Y allows it toMega Evolve into Mega Charizard Y if itsTrainer has aKey Stone. A Trainer can only Mega Evolve one Pokémon per battle (or only have one Mega-Evolved Pokémon at any given momentZA).
As aMega Stone, it is unaffected by item-negating effects (such asEmbargo andKlutz). Item-manipulating effects (such asTrick andFling) cannot give or remove a Charizardite Y from Charizard.
Outside of battle
If held by a Charizard, the Charizardite Y allows it to Mega Evolve into Mega Charizard Y when it performs aSpectacular Talent during aPokémon Contest Spectacular if its Trainer has a Key Stone. Charizard will remain a Mega Charizard Y until theTalent Round ends.
The player can obtain the Charizardite Y by reaching Trainer Rank 7 or finishing Mission Card 8.
The Charizardite Y was also available as a prize during the Mega Charizardcompetitive stage. This competitive stage ran on both versions the 3DS and Mobile from September 18 to 28, 2015 and March 8 to 15, 2016.
The Charizardite Y enables the following Mega Evolutions:
InA League of His Own!,Trevor was revealed to have obtained a Charizardite Y before the events of the episode. HisCharizard wears the Mega Stone on a ring around its tail.