Niantic has detailed GO Battle League: Mythical Wishes for Pokémon GO. Read on below to learn more:
GO Battle League: Mythical Wishes Update
Trainers,
GO Battle League: Mythical Wishes is almost here!
GO Battle League: Season of Light Schedule
GO Battle League: Mythical Wishes schedule
The following leagues will begin and end at 1:00 p.m. PST (GMT −8) on the dates listed below.
Starting with this Season, the schedule below will also be visible on the in-game GO Battle League Page!
Dec 1 – Dec 8
Dec 8 – Dec 15
Dec 15 – Dec 22
Dec 22 – Dec 29
Dec 29 – Jan 5
Jan 5 – Jan 12
Jan 12 – Jan 19
Jan 19 – Jan 26
Jan 26 – Feb 2
Feb 2 – Feb 9
Feb 9 – Feb 16
Nov 16 – Nov 23
Feb 23 – Mar 1
Regarding Classic Cups
Trainers, as Candy XL has continued to become more accessible thanks to Candy XL becoming available at level 31 (rather than level 40) and Rare Candy XL being a potential reward for completing in-person raids, we will be retiring the Classic Cup format after this Season. We will be running Premier Cups more frequently in future Seasons instead.
Mythical Wishes: GO Battle Days
Saturday, January 14, 2023, at 12:00 a.m. to Sunday, January 15, 2023, at 11:59 p.m. local time
Bonuses
- 4× Stardust from win rewards.
- The maximum number of sets you can play per day will be increased from five to 20—for a total of 100 battles—from 12:00 a.m. to 11:59 p.m. local time.
Timed Research
Timed Research
Timed Research focused on battling will be available for the whole weekend!
Complete the research to earn the following rewards.
- XP
- Rare Candy
- rings inspired by Steven Stone (Ruby/Sapphire)*
- An Elite Charged TM
Active Leagues
Active leagues
The following leagues will be active.
- Great League
- Ultra League
- Master League
GO Battle Day: Vulpix
Sunday, February 12, 2023, from 12:00 a.m. to 11:59 p.m. local time
Enjoy a GO Battle Day featuring the Fox Pokémon Vulpix!
Bonuses
- 4× Stardust from win rewards.
- The maximum number of sets you can play per day will be increased from five to 20—for a total of 100 battles—from 12:00 a.m. to 11:59 p.m. local time.
Featured Pokémon – Vulpix
Available from 11:00 a.m. to 2:00 p.m. local time
- Vulpix will be guaranteed to appear as a reward encounter.
- All win rewards from the Premium track will be reward encounters.
- You’ll have an increased chance of encountering Shiny Vulpix.
Timed Research
Timed Research focused on battling will be available for the whole day!
Complete the research to earn:
- XP
- Rare Candy
- Miltank encounter
- An Elite Charge TM
Ninetales
Evolve Vulpix to get a Ninetales that knows the Fast Attack Ember!
Active Leagues
Active Leagues The following leagues will be active.
- Ultra League
- Willpower Cup
GO Battle League: Season of Light rewards
Guaranteed rank-up encounters
You can encounter the following Pokémon once per season at the designated ranks.
Standard Encounters
You can encounter the following Pokémon in reward encounters throughout the season at the ranks shown in the image below.
GO Battle League Timed Research Pass
For our most dedicated battlers, a pass to access battle-themed Timed Research will be available in the in-game shop at no cost once GO Battle League: Season of Light begins.
This Timed Research will keep track of your victories throughout the Season. Each research page will require 100 wins to complete, and doing so will reward you with a small amount of Stardust and items such as an Elite Fast TM (400 wins) and Elite Charged TM (500 wins). Keep at it throughout the Season to see how far you can get!
Avatar items and other rewards
Pikachu Libre avatar items will be rewarded to Trainers who reach Rank 3.
Trainers will be able to earn the following avatar items. They’re all inspired by Steven Stone, Champion of the Hoenn region’s Pokémon League in the Pokémon Ruby, Pokémon Sapphire, Pokémon Omega Ruby, and Pokémon Alpha Sapphire games!
- At Ace rank, you’ll receive rings inspired by Steven Stone (Ruby/Sapphire)
- At Veteran rank, you’ll receive shoes inspired by Steven Stone (Ruby/Sapphire).
- At Expert rank, you’ll receive top inspired by Steven Stone (Ruby/Sapphire) and pants inspired by Steven Stone (Ruby/Sapphire).
- At Legend rank, you’ll receive the pose inspired by Steven Stone (Ruby/Sapphire).
At rank 19, you’ll receive an Elite Charged TM. You’ll also receive an Elite Fast TM as an end-of-Season reward.
At rank 19, you’ll receive an Elite Charged TM, and you’ll also receive an Elite Fast TM as an end-of-season reward.
Cups
You can look forward to the following cups this season.
Great League
- Pokémon must be at or below 1,500 CP to enter.
Great League
The 20 Pokémon most used by Trainers ranked Ace and above in the Great League will not be allowed in the Great League Remix.
The following Pokémon will not be allowed.
Ultra League
- Pokémon must be at or below 2,500 CP to enter.
Ultra Premier
- Pokémon must be at or below 2,500 CP to enter.
- Legendary Pokémon, Mythical Pokémon, and Ultra Beasts are not eligible.
Ultra Premier Classic
- Pokémon must be at or below 2,500 CP to enter.
- Legendary Pokémon, Mythical Pokémon, and Ultra Beasts are not eligible.
- Pokémon that have been powered up using Candy XL are not eligible.
Master League
- No CP Limit.
Master Premier Classic
- No CP Limit.
- Legendary Pokémon, Mythical Pokémon, and Ultra Beasts are not eligible.
- Pokémon that have been powered up using Candy XL are not eligible.
Master League: Mega Edition
- No CP limit.
- Mega-Evolved Pokémon are allowed.
Fighting Cup: Great League Edition Remix
- Pokémon must be at or below 1,500 CP to enter.
- Psychic-type Pokémon are not eligible.
The following Pokémon will not be allowed.
Holiday Cup: Great League Edition
- Pokémon must be at or below 1,500 CP to enter.
- Only Normal-, Grass-, Electric-, Ice-, Flying-, and Ghost-type Pokémon are eligible.
Holiday Cup: Ultra League Edition
- Pokémon must be at or below 2,500 CP to enter.
- Only Normal-, Grass-, Electric-, Ice-, Flying-, and Ghost-type Pokémon are eligible.
Weather Cup
- Pokémon must be at or below 1,500 CP to enter.
- Only Fire-, Water-, Ice-, and Rock-type Pokémon are eligible.
Electric Cup: Great League Edition
- Pokémon must be at or below 1,500 CP to enter.
- Only Electric-type Pokémon are eligible.
The following Pokémon will not be allowed.
Love Cup: Great League Edition
- Pokémon must be at or below 1,500 CP to enter.
- Only red- or pink-colored Pokémon are eligible.
- Eligible red-colored Pokémon
- Eligible pink-colored Pokémon
Hoenn Cup: Great League Edition
- Pokémon must be at or below 1,500 CP to enter.
- Only Pokémon with a Pokédex number from #252 to #386 will be allowed.
Attack Changes
Wing Attack
- Trainer Battles: Chance to lower the opposing Pokémon’s Attack is no longer guaranteed
Poison Fang
- Trainer Battles: Energy cost increased
Charm
- Trainer Battles:
16 power→ 15 power
Attack availability updates
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
Source: Official Pokémon GO blog
Pokémon Blog 
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