Tsukasa and Rui were rivals. Pokémon rivals. They use to be best friends in high school but Rui almost blew up Tsukasa so Tsukasa distanced himself from rui.Rui almost always won and it drove Tsukasa mad!

One day, Rui came up to him with his sly ass smile which annoyed Tsukasa so much “Oya!.Tsukasa-kun~! How about another Pokémon battle, Hm~?” Of course… he wanted to battle again…