Pokémon World Tournament is a new feature included in Pokémon Black 2 and White 2 which allows you to battle previous gym leaders, region champions, and important characters. Located in a new add-on area, south of Driftveil City, the PWT is unlocked right after you get your 5th gym badge, and although only one type of tournament is open to you at that point, more open up as you keep playing in the facility. The PWT features single and double battles as well as several different tournaments you can compete in.
The Pokémon World Tournament features several contestants from all walks of life, and all of the known regions to date. In the PWT you are able to battle not only regular, run-of-the-mill trainers, but also gym leaders and champions from the Kanto, Johto, Hoenn, Sinnoh and Unova leagues!
Single battles are confirmed, but double battles and triple battles may also be available. As seen above, battles will be 3 on 3 for one-on-one Pokémon battles.