From Bulbapedia, the community-driven Pokémon encyclopedia.
Theodore (Japanese: タクゾウ Takuzo) is a character of the day in To Thine Own Pokémon Be True!. He made it to the finals of the Pokémon Ping Pong Tournament with his Gliscor and lost against O and his Shiftry. He did not have a speaking role in the episode and never appeared in person, but his face appeared on the screen showing the finalists.
This listing is of Theodore's known Pokémon: