From Bulbapedia, the community-driven Pokémon encyclopedia.
Halverson (Japanese: ハクア Hakua) is one of the characters of the day in To Thine Own Pokémon Be True!.
Halverson was one of the participants in the Pokémon Ping Pong Tournament with his Marowak. Their first opponent was Jessie with Meowth. Halverson and Marowak won by default after Jessie's disqualification and moved on to the second round. They would then go on to be defeated by Dawn and Ambipom in the third round.
This listing is of Halverson's known Pokémon: