Trainer Battle

Trainer Battles are an upcoming feature in Pokémon GO. Trainers will need to choose a league before going into a Trainer Battle, with each league having different maximum Pokémon CP limits. Trainers can challenge one another using a Battle Code, assemble a team of three Pokémon, and see who comes out on top. When Trainer Battles are completed, both participants will receive great rewards, including a chance at rare Evolution Items.

Battle Leagues
There will be three Battle Leagues to choose from which include Great League, Ultra League, and Master League. Each Trainer will only be allowed to assign three Pokémon to a Battle League party.

Battles are fast-paced and real-time and a Trainer's selected team of Pokémon will be able to execute both their Fast Attack and Charged Attack moves. In preparation for battle, Trainers will even be able to use Stardust and Candy to unlock a bonus Charged Attack for there Pokémon. A Protect Shield may be deployed save Pokémon from critical damage, but their is a limit to how many can be used before the Pokémon will be left defenseless.

Trainers will usually have find other Trainers on their nearby tab to initiate a Trainer Battle, but Ultra and Best Friends can challenge each other from any distance.

Team Leader Battles
Team Leaders Spark, Candela, and Blanche will be available to battle. Trainers can earn rewards once per day when training with a team leader, including Stardust to help power up their Pokémon. Work toward earning an Ace Trainer medal.

Development
When designing Trainer Battles, Niantic wanted to create an experience that everyone could enjoy and ensure that different kinds of Pokémon can show their strengths. With Leagues in Trainer Battles, they hope to create a system that's accessible to many Trainers.