Pokémon Adventures Tail of Pichu

Are Ash is nearly killed by a psychotic trainer who claims to be his half-brother, he becomes Pokémon League Champion. After going to five different Pokémon League's he finally wins in Kalos. No one can forget the trainer who almost killed Ash and escaped, before he left he told Ash he has another brother. Ash doesn't have to find him because he will come to him.