Season 6

Season 6 of GO Battle League lasts from November, 2020 to January , 2021. It is preceded by Season 5 and will be succeeded by Season 7.

As mentioned in the GO Beyond announcement, the GO Battle League will expand from 10 to 24 ranks, and the top four ranks will have all-new names and corresponding badges, namely Ace, Veteran, Expert and Legend. The expanded ranks will be accompanied by a totally new reward structure, which gives Trainers more opportunities to earn exclusive rewards through ranking up. Rewards are tied to the theme of the Season as well.

Master League Classic was introduced in this Season, which only allows Pokémon that have not been powered up by Candy XL.

During this Season, Trainers still do not require walking to unlock battle sets.

Formats
Holiday Cup: Only Normal-, Grass-, Electric-, Ice-, Flying- and Ghost-type Pokémon allowed. 1,500 CP limit.

Ranks and Ratings
This season saw an increase in the ranking system with it going from 10 to 24 ranks. Rating is only shown after reaching rank 20.

There were some differences of requirements in game code before Season 6 started, which can be found in this link.

Rewards
This Season includes a unique reward track in certain ranks, meaning all five slots give the same rewards in those tracks. The rewards of the remaining ranks stay the same as previous Seasons.
 * Rank 5: Mysterious Item
 * Rank 10: 750 (Basic) / 1500 (Premium) Stardust
 * Rank 15: 1 (Basic) / 2 (Premium) Rare Candy
 * Rank 19: Pokémon Encounter

Basic Premium

Stardust

The random items include:
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Reaching rank 24 could earn avatar items and an avatar pose inspired by N.

Pokémon
Bulbasaur is the first guaranteed encounter. After that, each Starter Pokémon is the first guaranteed encounter of the rank shown below. Libre Pikachu is the first encounter in rank 24, one only.

Certain Legendary Pokémon could be obtained starting at rank 20 during their time in tier 5 Raid Battle.