Gallon

Gavin is a character of the day who appeared in From Brags to Riches. He is a Pokémon Trainer from Ganga Town, who competed in the Double Battle rounds of the Ever Grande Conference.

Gavin was facing Morrison in the Tournament. Gavin sent out his Machamp and Marowak to face off against Morrison's Growlithe and Gligar. The battle appeared even at first, but then Gavin gained the upper hand. Morrison refused to let that get him down, however, and he soon used his Gligar's Guillotine to knock out Machamp but soon after that, Marowak defeated Growlithe with Bone Club.

Once again, Morrison found himself at a disadvantage when Marowak froze one of Gligar's wings with Ice Beam. In a seemingly desperate move, he told Gligar to charge toward Marowak. The Fly Scorpion Pokémon used Iron Tail and defeated Marowak. Because of his loss, Gavin was eliminated from the Ever Grande Conference.

(Source: Bulbapedia)