Kimimaro

Timothy "Timmy" Grimm is a recurring character who appeared in the Pokémon anime. He is a Pokémon Coordinator from Verdanturf Town. With the help of his father, Timmy created his Phantom alter-ego to remain anonymous while he competed in Contests against the wishes of his mother, who instead wanted him to study so he could eventually take over the family business. (Source: Bulbapedia)