Some Pokémon have multiple different Mega Stones for their species. Every Pokémon that can undergo Mega Evolution has a corresponding Mega Stone that is named after it, except for Rayquaza, which instead needs to know the move Dragon Ascent to Mega Evolve. Pokémon only remain Mega Evolved during battles and Pokémon Contest Spectaculars, and will revert to their original state once the battle has ended or if they faint.
