Pocket Card Jockey. It's game directed by Go Ichinose - my favourite Game Freak's composer, and this is one of reasons why he didn't compose music for VI generation of Pokémon. I didn't purchase it (I can't do it at this moment), played in demo, but maybe I'll do it later, because I'm very curious this game. But I know whole this game's soundtrack and it's amazing, better than XY and ORAS music.