Goyou

Lucian (Goyou) is a master Psychic-type Trainer and member of the Sinnoh Elite Four.

Lucian made his debut in "An Elite Meet and Greet!" He was first seen battling using his Girafarig on television, but then met Ash and his friends in a Pokémon Center and had a battle against Dawn's Buizel. Lucian sent out his Bronzong. Buizel's attacks didn't have much of an effect, if any, on Bronzong. Following the attack Gyro Ball, Bronzong used Flash Cannon to defeat its opponent.

He also made a brief cameo on television in "Top-Down Training!" battling Cynthia and her Garchomp.

(Source: Bulbapedia)