Key Stone

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A Mega Ring (Japanese: メガリング Mega Ring) is a device that acts as a medium between a Pokémon Trainer and a Pokémon holding a Mega Stone in order to make them Mega Evolve. When the Mega Ring is activated, the Pokémon's corresponding Mega Stone reacts to it, starting the process. In order for the Mega Ring to work, it must have a Key Stone (Japanese: キーストーン Key Stone).

Possession of one Mega Ring is offered to the player and each of his or her friends, who have to pick the most deserving out of their group. The selection is quickly whittled down to two people, the player and Serena or Calem, depending on the gender of the player. Upon defeating Serena or Calem, the player has to defeat the Shalour Gym and then go to the top of the Tower of Mastery to retrieve the ring from Korrina.

After the player has beaten their rival in Kiloude City, Professor Sycamore will upgrade their Mega Ring at the Anistar Sundial by having the player touch the sundial. Once upgraded, the player can then find hidden Mega Stones around Kalos from 8:00 PM to 9:00 PM.

Variations

Several variations of the Mega Ring are known to exist, but each serves the same purpose.

Both Calem and Serena use the Mega Ring (Japanese: メガリング Mega Ring), which is a Key Stone embedded in a bracelet. They both wear it on their left wrist.
Korrina uses a Mega Glove (Japanese: メガグローブ Mega Glove), which is a Key Stone embedded in a left glove.
Lysandre uses a Mega Ring (Japanese: メガリング Mega Ring), which is a Key Stone embedded in a ring. He wears it on his middle finger on his left hand.
Diantha uses a Mega Charm (Japanese: メガチャーム Mega Charm), which is a Key Stone embedded inside a necklace. She wears it around her neck.

Appearance


Calem's Mega Ring	Serena's Mega Ring	Korrina and her Mega Glove	Diantha and her Mega Charm

Flavor text

Games	Description
	This ring contains an untold power that somehow enables Pokémon carrying a Mega Stone to Mega Evolve in battle.

In the anime

In the main series

File:Alan Mega Ring.png

The Mega Ring in the anime

In SS029, Alan is seen wearing a Mega Ring similar to that of the protagonists of Pokémon X and Y. He uses it to Mega Evolve his Charizard into Mega Charizard X.

In the same episode, Ayaka was shown wearing her Key Stone as an earring on her right ear, while Louie had his Key Stone embedded into the tip of the umbrella that he carries with him. Siebold, a member of the Kalos Elite Four, was seen wearing his Key Stone in his necktie.

In Pokémon Origins

Charizardite X and Key Stone in Pokémon Origins

While Red does not receive a Mega Ring or some variation thereof, in File 2 - Cubone, he receives a Key Stone alongside a Charizardite X from Mr. Fuji as thanks for driving Team Rocket out of the Pokémon Tower and helping the ghost of Marowak find peace. The Key Stone and Mega Stone activated in File 4 - Charizard during Red's showdown with Mewtwo, Mega Evolving his trusted starter Pokémon, Charizard, into Mega Charizard X and giving them the strength to weaken Mewtwo so that Red could catch it.