The Clubsplosion (Japanese: ドンナマイト Donamite) is an anime-exclusive, 16-competitor tournament held annually in Ambiga Town, Unova. It takes place in the local Battle Club and it is hosted by the town's Don George and Freddy O'Martian.
It was first mentioned in Climbing the Tower of Success!, when Stephan told Ash and his friends that he was going to enter. It took place from The Clubsplosion Begins! to Commanding the Clubsplosion Crown!.
While it is similar to the Club Battle held in Nimbasa Town, it focuses more on hand-to-hand combat as it is a tournament geared towards Trainers of Fighting-type Pokémon. However, Pokémon of all types are allowed to participate. The winner receives a year's supply of vitamins.
Montgomery was the winner of the previous year's Clubsplosion but lost his championship title to Stephan in Commanding the Clubsplosion Crown!.
The Clubsplosion is a 16-competitor tournament consisting of four rounds, and entrants are allowed one Pokémon each. All rounds consisted of Single Battles against randomly matched up Trainers by a computer.