Bug Trainer is the trainer whom Rusty asks to be his rival. The bug catcher readily agrees, but after a single battle refuses to be Rusty's rival any longer.
The Bug Trainer shares a sprite with the usual bug catcher sprite in Pokémon games.
The Bug Trainer first appeared in the episode Rusty's Rival, standing on the route Rusty happened to be passing through. After reading one of Red's tweets about defeating his rival, Rusty declares that he needs a rival and calls out to the nearby Bug Trainer. He excitedly accepts and they enter their first battle.
He is absent for much of the series, but when the perfect Bidoof takes over, ushering in the Eon of Doof, the Bug Trainer survives and joins Red's resistance team. He is one of the last few remaining members when Rusty is found.
- Despite being a bug catcher, he uses a Ratatta, a normal-type Pokémon.