What on Earth makes you guys think Cilan doesn't take battles seriously. He took his battle against Burgundy seriously(sure he destroyed her, doesn't mean he screwed around), his battles against Skyla, Pinot Noir, both battles against Trip, tags with Ash, all were serious. Some were against opponents that he didn't really care about but he still battled seriously. He has been seen training with Ash briefly, he taught his Stunfisk how to "fly" and his Pokemon have learned moves off screen more than once, he clearly trains.