Shiba

Shiba is a member of the Kanto Elite Four. He raises Fighting-type Pokémon, living with them and training with them. He joined the Elite Four out of a desire to challenge the best Trainers. Although he trains Fighting Pokémon, he also commonly uses Iwark and its evolved form.

Shiba regularly visits the Sevii Islands. He and his Pokémon use the spa on One Island, and he visits Two Island to buy RageCandyBars. Shiba once used to train with Touki, a Fighting-type Gym Leader from Hoenn.

(Source: Bulbapedia)