UPDATE 1/25/21: Introducing the Love Cup, which will run from Monday, February 8, 2021, at 1:00 p.m. to Monday, February 15, 2021, at 1:00 p.m. PST (GMT −8). In this format, only red or pink Pokémon with 1,500 CP or less will be allowed to participate. Legendary and Mythical Pokémon will not be eligible.

• Here’s a list of Pokémon that are eligible for the Love Cup: 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, Sunny Form Castform, 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.
  • Please note that Galarian Mr. Mime, Galarian Darumaka, and Galarian Darmanitan are not eligible.

UPDATE 1/5/21: We’ve shared more details about the remainder of GO Battle League Season 6! Here’s a summary of the new information.

• The Great League will run from Monday, January 11, 2021, at 1:00 p.m. to Monday, January 25, 2021, at 1:00 p.m. PST (GMT −8).
• The Ultra League and its Premier Cup will run from Monday, January 25, 2021, at 1:00 p.m. to Monday, February 8, 2021, at 1:00 p.m. PST (GMT −8).
• The Master League, its Premier Cup, Master League Classic, and a to-be-announced special cup will run from Monday, February 8, 2021, at 1:00 p.m. to Monday, February 15, 2021, at 1:00 p.m. PST (GMT −8). We’ll share the details of how this cup will work in a later update.
• All three leagues and the Ultra League Premier Cup will run from Monday, February 15, 2021, at 1:00 p.m. to Monday, February 22, 2021, at 1:00 p.m. PST (GMT −8).
• The Kanto Cup will run from Monday, February 22, 2021, at 1:00 p.m. to Monday, March 1, 2021, at 1:00 p.m. PST (GMT −8). The CP limit for this cup will be 1,500, and only Pokémon with a Pokédex number between 001 and 151 will be allowed. During this period, your rating will be unaffected.
• When you reach rank 20, you’ll be guaranteed to encounter Frillish, which is making its Pokémon GO debut! You’ll have a chance of encountering it on the rewards tracks for higher ranks, too!
• At rank 19, you’ll now receive an Elite Charged TM.
• You’ll also receive an Elite Fast TM as an end-of-season reward if you reach rank 19.

Attack Updates

The following attacks will be updated for Trainer Battles.

• Ember: This Fire-type Fast Attack will now deal more damage.

• Karate Chop: This Fighting-type Fast Attack will now generate more energy.

• Bubble: This Water-Type Fast Attack will now deal less damage.

• Razor Leaf: This Grass-Type Fast Attack will now deal less damage.

• Crabhammer: This Water-type Charged Attack will now deal more damage.

• Sky Attack: This Flying-type Charged Attack will now deal less damage.

• Rock Slide: This Rock-type Charged Attack will now deal less damage.

• Shadow Bone: This Ghost-type Charged Attack will now deal less damage.

The following attacks will be available to Pokémon that couldn’t learn them before.

• Fire-type Weather Ball: This powerful Fire-type attack will now be available to Vulpix and Ninetales originally discovered in the Kanto region.

• Ice-type Weather Ball: This powerful Ice-type attack will now be available to Vulpix and Ninetales originally discovered in the Alola region.

• Water-type Weather Ball: This powerful Water-type attack will now be available to Politoed.

• Ice Punch: This powerful Ice-type attack will now be available to Primeape.

• Ice Beam: This powerful Ice-type attack will now be available to Claydol.

• Shadow Ball: This powerful Ghost-type attack will now be available to Claydol.

• Tri Attack: This powerful Normal-type attack will now be available to Porygon-2.

• Mud Shot: This powerful Ground-type Fast Attack will now be available to Excadrill.

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Trainers,

As previously mentioned, the introduction of Seasons also brings exciting changes to the GO Battle League! The GO Battle League will expand from 10 to 24 ranks, and the top four ranks will have all-new names and corresponding badges. The expanded ranks will be accompanied by a totally new reward structure, which gives Trainers more opportunities to earn exclusive rewards through ranking up. You can expect the GO Battle League rewards to be tied to the theme of the current Season, too!

GO Battle League seasons will occur in tandem with the overarching Seasons and will rotate formats over the same three-month period. Season 6 of the GO Battle League will take place during the Season of Celebration!

Season 5 rewards, Season 6 timeline, and what to expect

When Season 6 begins on Monday, November 30, 2020, at 1:00 p.m. PST (GMT −8), your end-of-season rewards for Season 5 will be available on the Battle screen, including an Elite Charged TM if you reached rank 7 or higher. The dates in the schedule below are tentative and only cover the first half of Season 6. Stay tuned—we’ll update you if anything changes, and we’ll share more details on the second half of Season 6 later.

• The Great League will run from Monday, November 30, 2020, at 1:00 p.m. to Monday, December 14, 2020, at 1:00 p.m. PST (GMT −8).
• The Ultra League and its Premier Cup will run from Monday, December 14, 2020, at 1:00 p.m. to Monday, December 28, 2020, at 1:00 p.m. PST (GMT −8).
• The Master League, its Premier Cup, Master League Classic, and Holiday Cup will run from Monday, December 28, 2020, at 1:00 p.m. to Monday, January 4, 2020, at 1:00 p.m. PST (GMT −8). Only Pokémon that haven’t been powered up with Candy XL are allowed in the Master League Classic. Please see below for more details on what Pokémon will be allowed in the Holiday Cup.
• All three leagues and the Ultra League Premier Cup will run from Monday, January 4, 2020, at 1:00 p.m. to Monday, January 11, 2020, at 1:00 p.m. PST (GMT −8).
• The Great League will run from Monday, January 11, 2021, at 1:00 p.m. to Monday, January 25, 2021, at 1:00 p.m. PST (GMT −8).
• The Ultra League and its Premier Cup will run from Monday, January 25, 2021, at 1:00 p.m. to Monday, February 8, 2021, at 1:00 p.m. PST (GMT −8).
• The Master League, its Premier Cup, Master League Classic, and a to-be-announced special cup, will run from Monday, February 8, 2021, at 1:00 p.m. to Monday, February 15, 2021, at 1:00 p.m. PST (GMT −8). We’ll share the details about the to-be-announced cup later.
• All three leagues and the Ultra League Premier Cup will run from Monday, February 15, 2021, at 1:00 p.m. to Monday, February 22, 2021, at 1:00 p.m. PST (GMT −8).
• The Kanto Cup will run from Monday, February 22, 2021, at 1:00 p.m. to Monday, March 1, 2021, at 1:00 p.m. PST (GMT −8). Please see below for more details on what Pokémon will be allowed in the Kanto Cup.
• Introducing the Love Cup, which will run from Monday, February 8, 2021, at 1:00 p.m. to Monday, February 18, 2021, at 1:00 p.m. PST (GMT −8). In this format, only red or pink Pokémon with 1,500 CP or less will be allowed to participate. Legendary and Mythical Pokémon will not be eligible.
  • Here’s a list of Pokémon that are eligible to enter in the Love Cup: 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.
  • Please note that Galarian Mr. Mime, Galarian Darumaka, and Galarian Darmanitan are not eligible.

What’s new in Season 6?

There are some notable changes coming to the GO Battle League for Season 6.

• The number of ranks have been increased from 10 to 24. You’ll progress through ranks 1 to 20 by participating in battles and securing wins. You can achieve the top four ranks by reaching a certain rating.
• Ace: 2,000
• Veteran: 2,500
• Expert: 2,750
• Legend: 3,000
• The rank-reward system has been updated. The following ranks will be unique in terms of how players progress through them and the rewards granted on the rewards tracks. Once you reach these ranks, you need to only complete one set of battles to progress to the next rank.
• Rank 4: The rewards will be mystery items.
• Rank 9: The rewards will be Stardust.
• Rank 14: The rewards will be Rare Candies.
• Rank 19: The rewards will be Pokémon encounters.
• Enjoy additional Stardust bonuses for a limited time. During the Master League, its Premier Cup, Master League Classic, and Holiday Cup —from Monday, December 28, 2020, at 1:00 p.m. to Monday, January 4, 2020, at 1:00 p.m. PST (GMT −8)—you’ll earn twice the Stardust for winning battles and completing battle sets.
• You won’t want to miss these Season 6 rewards. The Pikachu Libre avatar items will be a reward for Trainers who reach rank 10. Trainers who reach Legend rank will earn avatar items and a pose inspired by N, who made his first appearance in Pokémon Black Version and Pokémon White Version. At rank 19, you’ll receive an Elite Charged TM. You’ll also receive an Elite Fast TM as an end-of-season reward.
• The Pokémon you’ll encounter will be inspired by N’s seasonal teams in Pokémon Black Version and Pokémon White Version. Additionally, players who reach rank 20 can encounter the Legendary Pokémon that is available to battle in five-star raids at that time.
• Pokémon that you’ll be guaranteed to encounter at each rank will now include the following Pokémon.
• Various Ranks: You’ll be guaranteed to encounter some first partner Pokémon originally discovered in various regions as you progress through the ranks. These guaranteed encounters will occur only once, when you reach their corresponding rank.
• Rank 15: You’ll be guaranteed to encounter Chespin. You will also have a chance of encountering it on the rewards tracks for higher ranks!
• Rank 16: You’ll be guaranteed to encounter Fennekin. You’ll also have a chance of encountering it on the rewards tracks for
  higher ranks!
• Rank 17: You’ll be guaranteed to encounter Froakie. You’ll also have a chance of encountering it on the rewards tracks for
  higher ranks!
• Rank 20: You’ll be guaranteed to encounter Frillish, which is making its Pokémon GO debut! You’ll have a chance of encountering it on the rewards tracks for higher ranks, too!
• Legend Rank: You’ll be guaranteed to encounter a Pikachu Libre. This will be the only time you’ll be able to encounter a Pikachu Libre during the season.
• You’ll be able to enjoy new GO Battle League cups!
• The Holiday Cup will run from Monday, December 28, 2020, at 1:00 p.m. to Monday, January 4, 2020, at 1:00 p.m. PST (GMT −8). The CP limit for this cup will be 1,500, and only Normal, Grass, Electric, Ice, Flying, and Ghost types will be allowed.
• The Kanto Cup will run from Monday, February 22, 2021, at 1:00 p.m. to Monday, March 1, 2021, at 1:00 p.m. PST (GMT −8). The CP limit for this cup will be 1,500, and only Pokémon with a Pokédex number from 001 to 151 will be allowed. During this period, your rating will be unaffected.
• Stay tuned for details on the GO Battle League cups to be featured in the second half of Season 6.
• At the start of the season, your rating will be reset.

Attack updates

The following attacks will be updated for Trainer Battles.

• Ember: This Fire-type Fast Attack will now deal more damage.
• Karate Chop: This Fighting-type Fast Attack will now generate more energy.
• Bubble: This Water-Type Fast Attack will now deal less damage.
• Razor Leaf: This Grass-Type Fast Attack will now deal less damage.
• Crabhammer: This Water-type Charged Attack will now deal more damage.
• Sky Attack: This Flying-type Charged Attack will now deal less damage.
• Rock Slide: This Rock-type Charged Attack will now deal less damage.
• Shadow Bone: This Ghost-type Charged Attack will now deal less damage.

The following attacks will be available to Pokémon that couldn’t learn them before.

• Fire-type Weather Ball: This powerful Fire-type attack will now be available to Vulpix and Ninetales originally discovered in the Kanto region.
• Ice-type Weather Ball: This powerful Ice-type attack will now be available to Vulpix and Ninetales originally discovered in the Alola region.
• Water-type Weather Ball: This powerful Water-type attack will now be available to Politoed.
• Ice Punch: This powerful Ice-type attack will now be available to Primeape.
• Ice Beam: This powerful Ice-type attack will now be available to Claydol.
• Shadow Ball: This powerful Ghost-type attack will now be available to Claydol.
• Tri Attack: This powerful Normal-type attack will now be available to Porygon-2.
• Mud Shot: This powerful Ground-type Fast Attack will now be available to Excadrill.

Please be aware of your surroundings and follow guidelines from local health authorities when playing Pokémon GO. Upcoming events are subject to change. Be sure to follow us on social media, opt in to receiving push notifications, and subscribe to our emails to stay updated. For the latest on in-game events and feature updates, be sure to check this help center article.

—The Pokémon GO team