GO Battle League is a feature in Pokémon GO that allows trainers to battle opponents around the globe in online Trainer Battles. The feature is released on January 29th, 2020. It is only available to Trainers level 10 and up. Only one Pokémon of a single species can be assigned to a Battle Party. Since April 10th, 2020, the GO Battle League leaderboard was introduced to show the top five hundred Trainers in the world.