A Mega Stone can be obtained by find and defeating a Mega Evolved boss Pokémon, who will drop its corresponding Mega Stone upon defeat. If the Mega Stone has not already been obtained from a boss Pokémon before, it will always be dropped by the boss Pokémon; otherwise, it will have a 1 chance of being dropped.
A Pokémon can Mega Evolve in battle only if it is holding its corresponding Mega Stone and if its holder is wearing a Mega Ring.
List of Mega Stones
|Mega Stone||Mega Evolution|
|Charizardite X||Mega Charizard X|
|Charizardite Y||Mega Charizard Y|