Season 10

Season 10 of GO Battle League lasted from November, 2021 to March , 2022. It is preceded by Season 9 and succeeded by Interlude Season. This GO Battle League Season ran concurrently with Season of Heritage.

In this Season, Trainers who reach Legend rank would be able to register early for certain Pokémon GO World Championship Series events. Pokémon in reward encounters were slightly easier to catch. Sinnoh Cup and Johto Cup were introduced.

Formats
Great League Remix: 1,500 CP limit. Top 20 Pokémon banned.

Ultra League Remix: 2,500 CP limit. Top 10 Pokémon banned.

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

Sinnoh Cup: 1,500 CP limit. Only Pokémon with a Pokédex number between #387 and #493 allowed.

Love Cup: 1,500 CP limit. See official blog post for allowed Pokémon.

Johto Cup: 1,500 CP limit. Only Pokémon with a Pokédex number between #152 and #251 allowed.

Rewards
Basic Premium
 * Rank 5: Mysterious Item
 * Rank 10: 750 (Basic) / 1500 (Premium) Stardust
 * Rank 15: 1 (Basic) / 2 (Premium) Rare Candy
 * Rank 19: Pokémon Encounter
 * Other ranks:

Stardust

The random items can include:
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Reaching rank 19 awarded:

Reaching Ace rank and above awarded avatar items and an avatar pose inspired by Lysandre from Pokémon X and Y.

Pokémon
Guaranteed first Pokémon encounters:
 * Pyroar: rank 1 (one only)
 * Mienfoo: rank 6
 * Noibat: Veteran rank
 * Deino: Expert rank
 * Pikachu Libre: Legend rank (one only)

Tier 5 Raid Bosses could be obtained starting at rank 20 during their time in raids.

End-of-Season rewards

 * (rank 19 or above)

January, 2022
GO Battle Day took place on January, 2022 from 12 a.m. to 11:59 p.m. local time. Master League and Master League Classic were available during this GO Battle Day.

January, 2022
GO Battle Day took place on January, 2022 from 12 a.m. to 11:59 p.m. local time. Great League and Sinnoh Cup were available during this GO Battle Day.

February, 2022
GO Battle Day took place on February, 2022 from 12 a.m. to 11:59 p.m. local time. Ultra League and Ultra Premier Classic were available during this GO Battle Day.

Attack updates
These Attack updates went live at the start of the Season:

Attack changes

 * Rock Tomb: 100% chance to reduce the opponent's Attack by 1 stage in Trainer Battles.
 * Pound: Base power was reduced from 5 to 4 in Trainer Battles.
 * Bug Buzz: Base power was increased from 90 to 100 in Trainer Battles and Gym and Raid Battles.

Attack availability
Some Pokémon received new Attacks to their standard Attack pools:

Trivia

 * Season 10 was originally planned to end on February, 2022. It was extended for one more day when the Interlude Season was announced.