By defeating a Mega Evolved boss Pokémon, the player will unlock the option to wear a Mega Bracelet. Once this option is available, the player can wear and take off the Mega Bracelet in the inventory screen. The Mega Bracelet will be visible on the player's left hand when it is worn.
A Mega Bracelet must be unlocked and worn for a player to Mega Evolve a Pokémon. If a player wears a Mega Bracelet, a Pokémon owned by the player will be able to Mega Evolve in battle if it is holding its corresponding Mega Stone. If the Mega Bracelet has not been unlocked, or if the player has unlocked the Mega Bracelet but is not wearing it, Mega Evolution cannot be used.