An unamed trainer who was traveling on Mandarin Island when Ash Ketchum challenged him to a Pokémon battle. Among his Pokémon are a Tauros and a highly experienced Persian that knows Thunderbolt.
During his battle with Ash Ketchum, Squirtle managed to defeat Persian with a Skull bash after enduring its Thunderbolt. The trainer then used Tauros who quickly defeated Squirtle but lost to Charizard's Flamerthrower even though it used Take Down on it first.