From Bulbapedia, the community-driven Pokémon encyclopedia.
Pokémon Battle Clubs (Japanese: バトルクラブ Battle Club) are anime-exclusive facilities in the Unova region where Pokémon Trainers can go to hone their battling skills. Battle Clubs are owned by Don George and are designed to offer Trainers methods and apparatus to train Pokémon for battles.
Battle Clubs have many features inside. There are computers that show Trainers information about other Trainers and their Pokémon. These are able to be used to access Xtransceivers and to ask the Trainer for a battle. The main part is a battleground where Trainers come to battle and learn tips from the battle master, Don George. At the back of the facility, there is a storage room with security cameras and alarms.
Ash and Iris arrived in the Battle Club in Accumula Town in The Battle Club and Tepig's Choice!. They witnessed a battle between one Trainer's Servine and another's Dewott. Ash battled the Trainer's Dewott with his Pikachu, but the battle was called off after Team Rocket set off the alarms while trying to steal food. With a mysterious Pokémon around, Ash and Iris helped look for it, and decided to lure it out with food. Ash discovered it to be a Tepig and nursed it back to health. Later, Team Rocket appeared and tried to steal Pikachu, but with Tepig's help, Ash foiled their plans. Ash then captured Tepig.
Another Battle Club located in Luxuria Town appeared in A Rival Battle for Club Champ!, where Ash had a battle with Trip. Trip wanted to have a Full Battle, but Ash only had five Pokémon at the time, so Trip agreed to a five-on-five match. Ash was able to knock out Trip's Tranquill and Servine, but ultimately lost the battle.
There is also a Battle Club in Nacrene City, which appeared in The Battle According to Lenora! and Rematch at the Nacrene Gym!. It was shown to have a gymnasium where Trainers can train their Pokémon on various equipment, such as running machines with obstacles, dumbbells, and a swimming pool with waves. Ash went there to train his Oshawott and Tepig for their rematch against Lenora, and they worked hard to learn Aqua Jet and Flame Charge, respectively.
In Evolution by Fire!, Ash, Iris, and Cilan came to visit the Battle Club in Astilbe Town. There, they witnessed a battle between Shamus and Kylan, which Shamus easily won. Later, it was revealed that Shamus was the original Trainer of Ash's Tepig. Shamus wanted to prove that Tepig was useless and challenged Ash to a battle, which took place in the Battle Club. Ash used his Tepig and Snivy, while Shamus used Emboar and Heatmor. Tepig evolved into Pignite during the battle and defeated both of Shamus's Pokémon.
Different kinds of Battle Clubs are located in Nimbasa Town and Ambiga Town. These Battle Clubs are designed as stadiums and once in a while tournaments are held here: the Club Battle in Nimbasa Town and the Clubsplosion in Ambiga Town.
Luxuria Town's battleground
The computer system in Battle Clubs
Luxuria Town's scoreboard
The Nacrene Battle Club gymnasium
The Nacrene Battle Club Swimming Pool
List of Battle Clubs
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