Halverson is a Pokémon Trainer who competed in the Pokémon Ping Pong Competition.
Pokémon the Series: Diamond and Pearl
Halverson and his Marowak played against Jessie and Meowth. The Pokétch decided that Halverson can go first, so Halverson started the play. Halverson and his Marowak gave Jessie and Meowth a hard time and Meowth used Fury Swipes on the ball, cutting the ball in the process. Jessie and Meowth were disqualified due to the fact that using moves weren't allowed, so Halverson and his Marowak won the round.