Season 6

Season 6 of GO Battle League lasted from November, 2020 to March , 2021. It is preceded by Season 5 and 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.

Ultra Premier Cup and Master League Classic were introduced in this Season. The latter only allows Pokémon that have not been powered up by Candy XL.

Information of the second half of this Season was announced on January, 2021. It also mentioned Master League will be reworked.

During this Season, Trainers still did 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.

Love Cup: 1,500 CP limit. Allowed Pokémon:

Charmander, Charmeleon, Charizard, Vileplume, Paras, Parasect, Krabby, Kingler, Voltorb, Electrode, Goldeen, Seaking, Jynx, Magmar, Magikarp, Flareon, Ledyba, Ledian, Ariados, Yanma, Scizor, Slugma, Magcargo, Octillery, Delibird, Porygon2, Magby, Torchic, Combusken, Blaziken, Wurmple, Medicham, Carvanha, Camerupt, Solrock, Corphish, Crawdaunt, Kricketot, Kricketune, Trash Cloak Burmy, Trash Cloak Wormadam, Magmortar, Porygon-Z, Wash Rotom, Tepig, Pignite, Emboar, Pansear, Simisear, Throh, Venipede, Scolipede, Krookodile, Darumaka, Darmanitan, Dwebble, Crustle, Autumn Form Deerling, Spring Form Deerling, Shelmet, Accelgor, Pawniard, Bisharp, Braviary, Heatmor, Fennekin, Braixen, Delphox, Fletchling, Fletchinder, Talonflame, Clefairy, Clefable, Jigglypuff, Wigglytuff, Slowpoke, Slowbro, Exeggcute, Lickitung, Happiny, Chansey, Mr. Mime, Mime Jr., Porygon, Cleffa, Igglybuff, Flaaffy, Hoppip, Slowking, Snubbull, Corsola, Smoochum, Miltank, Blissey, Whismur, Skitty, Milotic, Gorebyss, Luvdisc, Cherubi, Sunny Form Cherrim, Lickilicky, Audino, Alomomola, and Scrafty.

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 included a unique reward track in certain ranks, meaning all five slots give the same rewards in those tracks. The rewards of the remaining ranks stayed 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 included:
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Reaching rank 24 could earn avatar items and an avatar pose inspired by N.

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

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

End-of-season rewards

 * (rank 19 or above)

Events

 * GO Battle League was temporarily closed for a while after the global downtime on December, 2020.
 * Suicune was erroneously in the rewards on January, 2021 for few hours. The correct Pokémon was supposedly to be Raikou.
 * GO Battle League was temporarily closed twice during Pokémon GO Tour: Kanto on February, 2021.