Korrina

Korrina is the Shalour City Gym Leader and the successor of the Tower of Mastery. Her Gym has of sets of rails that the player must ride to reach her. She also gives the player a Lucario, which has a Mega Stone to Mega Evolve it. She can be fought at the Battle Chateau if a Writ of Invitation is sent out.

Trivia

 * She is one of few Gym Leaders that has more than one VS. Artwork in Pokémon X and Y.
 * Her name may been a pun on "careening", which is going fast without any control, usually leading to crashes. The fact she's a rollerskater supports this.