Diantha is the champion of the Kalos region and is a big star overall in the region. She is eager to meet new people nad challenged Ash to a battle, despite him not having beaten the league.
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Gardevoir
Gardevoir was used during Diantha's battle against Ash's Pikachu. It has the move of Teleport, Shadow Ball and Moonblast which can be used to do serious damage to the enemies. It has the ability to Mega Evolve, which it did following a capture plot by Team Rocket.