Antony

Anthony is a Pokémon Trainer from Hoenn who is a character of the day in You Said a Mouthful! (AG010).

He ran a private unofficial Gym for bragging rights, but cheated by having several other Pokémon ride inside his Pelipper's mouth, which allowed it to pull off attacks it wouldn't naturally learn and let it avoid weaknesses. He was very arrogant and cruel to those he beat. This arrogance attracted the attention of Team Rocket, who found out about Anthony's scheme and blackmailed him into giving them his Pelipper and the other occupants of its beak. Team Rocket accidentally revealed the scheme to Ash, who helped recover Pelipper and the others.

After being untied by Max, Anthony apologized for his scheme. Afterwards, he agreed to close down his Gym and promised to work harder by properly training Pelipper, rather than cheating.

(Source: Bulbapedia)