Ash, Serena, Clemont, and Bonnie meet Diantha, the Champion of the Kalos region! Professor Sycamore is on the scene as well, doing research on Diantha’s Gardevoir and its Mega Evolution.
Ash challenges the Champion to a battle, and under unusual circumstances, she accepts. However, their battle is quickly interrupted by the Team Rocket trio, who grab Gardevoir in a cage of energy and fly away! Thanks to the strong bond between the two of them, Diantha knows exactly where Gardevoir is, and she leads our heroes there at once.
She challenges Team Rocket, calling on the power of her Key Stone—and inside the cage, Gardevoir Mega Evolves! Professor Sycamore is delighted to witness a Mega Evolution in person, and Mega Gardevoir makes short work of the villains. Diantha has to get back to a movie shoot, but she agrees to battle Ash again someday...just as soon as he beats the Kalos League!