Niantic has announced the Pokémon GO Holidays 2021 festivities and the full details are listed below. The events take place from Thursday, December 16th, 2021 at 10:00 a.m. to Friday, December 31st, 2021 at 8:00 p.m. local time.

Pokémon GO Holidays 2021: Bergmite’s Pokémon GO debut, new costumes and avatar items, and more!

Trainers, The Pokémon GO Holidays event returns for 2021! We hope Trainers worldwide enjoy the festivities we have planned.

Look forward to Bergmite’s Pokémon GO debut, costumed Pokémon, event-exclusive Field Research, winter-themed avatar items, and a bonanza of bonuses.

YouTube Clip - Pokémon GO: Play together this season

Source: https://www.youtube.com/watch?v=ebmSBZTCbzU

Pokémon GO Winter Holiday

Thursday, December 16, 2021 at 10:00 a.m. to Friday, December 31, 2021 at 8:00 p.m. local time

Available during the entire Event unless otherwise stated.

The Season of Heritage Story Continues!

After the first door mechanism activated and Pokémon like Druddigon emerged, Blanche and Professor Willow decide to take a break and celebrate with a gift exchange with the other team leaders!

Catch up on the story so far on the Season of Heritage web page.

New game features launching!

Being together is the best gift of all, and you’ll be able to save a little bit of this feeling of togetherness with Gifts from your friends.

This holiday season, we’re excited to launch the Postcard Book! Ever wanted to save memories from locations that you or your friends visited? You’ll soon be able to by pinning Postcards to your Postcard Book.

For more details about the Postcard Book feature, click here.

Holiday Cup

The Holiday Cup will be available in the GO Battle League! Check out the Season 10 GO Battle League blog for details on the cup’s rules.

Event Bonuses

Open up to 45 Gifts per day, and hold up to 40 Gifts in your Item Bag
Mega Abomasnow CP boost
Team GO Rocket Grunts will have more Water and Ice-type Pokémon

Costumed Pokémon

You’ll be able to encounter costumed Pokémon!


: If you’re lucky, you might encounter a Shiny one!

New Avatar Items, Stickers, and Bundles

The following new avatar items will be available to purchase in the in-game shop starting on Wednesday, December 15, 2021, at 1:00 p.m. PST (GMT −8) and will continue to be available after the event ends!

• Festive Hat
• Festive Jacket
• Festive Shorts

You’ll be able to get holiday-themed stickers by spinning PokéStops, opening Gifts, and purchasing them from the in-game shop.

Some festive bundles will also be available for purchase in the shop throughout the event.

• Special Box (480 PokéCoins): 50 Poké Balls, two Premium Battle Passes, two Super Incubators, three Star Pieces
• Ultra Box (1,480 PokéCoins): 25 Ultra Balls, 18 Raid Passes, five Super Incubators, five Incense
• Adventure Box (1,480 PokéCoins): 18 Super Incubators, two Incubators, two Incense, four Star Pieces

Pokémon GO Holidays: Part 1

Thursday, December 16, 2021, at 10:00 a.m. to Thursday, December 23, 2021, at 10:00 a.m. local time

Available during the time indicated above unless otherwise stated.


: If you’re lucky, you might encounter a Shiny one!

Raid

The following Pokémon will be appearing in raids.


: If you’re lucky, you might encounter a Shiny one!

Field Research Task Encounters

The following Pokémon will be available to encounter when you complete Field Research tasks!


: If you’re lucky, you might encounter a Shiny one!

Play together during December Community Day!

Our final Community Day event for 2021 will be held on both Saturday, December 18, 2021, and Sunday, December 19, 2021. During the event, Pokémon featured throughout 2021’s Community Day events will be appearing more frequently in the wild. Additionally, Pokémon featured in 2020’s Community Day events will be hatching from Eggs and appearing in raids. December Community Day will be an awesome opportunity to catch any featured Pokémon you may have missed!

For more details, check out the December Community Day blog.

Pokémon GO Holidays: Part 2

Thursday, December 23, 2021, at 10:00 a.m. to Friday, December 31, 2021, at 8:00 p.m. local time

Available during the time indicated above unless otherwise stated.

A Gift from Your First PokéStop Spin Each Day!

During part 2 of the event, you’ll get an Egg Incubator for spinning your first PokéStop each day!

Even More Timed Research!

Two Timed Research lines focused on friendship and catching Pokémon will be available during part 2 of the event!

Complete them for fun surprises and rewards! Each of these research lines will lead to an encounter with Galarian Mr. Mime!

A Winter Wonderland Mini-Event

A special mini-event will take place from Saturday, December 25, 2021, at 10:00 a.m. to Sunday, December 26, 2021, at 8:00 p.m. local time.

Available during the time indicated above unless otherwise stated.

Collection Challenge

A Collection Challenge focused on trading with your friends will be available from Saturday, December 25, 2021, to Friday, December 31, at 8:00 p.m. local time.

You will need to trade for the following Pokémon to complete this challenge.

• Swinub
• Snorunt
• Spheal (Doesn’t need to be costumed)
• Snover
• Vanillite
• Cubchoo (Doesn’t need to be costumed)

Complete the challenge to encounter Galarian Mr. Mime!

Winter Wonderland Bonus

You’ll be able to trade with Trainers up to 40 km away.

Field Research Task Encounters

Additional Field Research tasks will be available for the duration of the mini-event that reward the following.


: If you’re lucky, you might encounter a Shiny one!

Wild Encounters

The following Pokémon will be available to encounter in the wild.


: If you’re lucky, you might encounter a Shiny one!
* The Cubchoo appearing in the wild during the Spotlight Hour on December 28 will be costumed.

Raids

The following Pokémon will be appearing in raids. Also, for the first time in Pokémon GO, you’ll be able to encounter a Shiny Galarian Darumaka, if you’re lucky!


: If you’re lucky, you might encounter a Shiny one!

Eggs

The following Pokémon will be hatching from Eggs obtained during the event.


: If you’re lucky, you might encounter a Shiny one!
: This list is organized by rarity, with one Egg icon being most common and five Egg icons being most rare.

Field Research Task Encounters

: If you’re lucky, you might encounter a Shiny one!

Source: https://pokemongolive.com/post/holiday2021/