Giant and his Hitmonlee intended to compete in the P1 Grand Prix, however, Team Rocket wanted to compete to get the reward and stole Giant's Hitmonlee, his clothes and locked him in a bathroom. It is unknown what happened to Giant afterwards.
Hitmonlee is Giant's only known Pokémon. Giant and Hitmonlee were planning on entering the P1 Grand Prix until Team Rocket spotted Hitmonlee. They took Giant's clothing, Hitmonlee and locked Giant in a bathroom so they could enter the tournament to win the prize. Known moves: Mega Kick and Hi Jump Kick.