Pokémon League is a center where all Pokémon trainers come to battle the leaders of all trainers. To enter you have to collect all of the badges. Also, you are only allowed to use six Pokemon at a time, both in the games and the anime. However, unlike in the games, in the anime a lot of Trainers participate and battle each other, whereas in the games only the player is battling the Elite Four.
The Sinnoh Pokémon League is located at the north of Sunyshore City, where players have to cross the water route and enter the Sinnoh Victory Road to reach there. This marks the first time the Champion has been female.
In Black and White Versions 2, the Pokémon League is situated eastwards of Humilau City; to arrive, the player must cross a land route briefly interrupted by the Giant Chasm and pass the Victory Road.
This marks the first time where the Elite Four (apart from the Champion) can be battled in any order, the Champion still cannot be battled until after Shauntal, Grimsley, Caitlin and Marshal have been battled. The Champion in Black 2 and White 2, Iris, is the youngest Champion at around age 12.
No information has currently been released regarding the Pokemon League in the Kalos region.