Season 1

Season 1 of GO Battle League lasts from March, 2020 to May , 2020. It is preceded by Preseason.

Schedule

 * Battle League Great.png Great League: March, 2020 to March , 2020
 * Battle League Ultra.png Ultra League: March, 2020 to April , 2020
 * Battle League Master.png Master League: April, 2020 to April , 2020
 * GO Battle League.png All three Leagues: April, 2020 to May , 2020

Ranks and Ratings
The requirements are different from Preseason.

Rewards
Basic Premium

The random items include:
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Reaching rank 10 can earn avatar items and an avatar pose inspired by Steven.

Pokémon
Metagross is the first guaranteed and Scraggy is the first encounter in rank 4 if Metagross has already be encountered. Pikachu Libre is the first encounter in rank 10, one only.

Certain Legendary Pokémon or Mythical Pokémon can be obtained starting at rank 4 during their time in tier 5 Raid Battle.

End-of-season rewards

 * (rank 7 or above)

Events

 * GO Battle League Season 1 Launch Celebration was held to promote Season 1.
 * When Season 1 was initiated, the rank and rating of Trainers were slightly altered from that in Preseason. Later, Niantic adjusted all Trainers to rank 1.
 * Due to coronavirus outbreak, trainers do not require walking or PokéCoins to unlock battle sets since the start of Season 1.