Niantic has announced the New Year's event festivities that will take place in Pokémon GO from Friday, December 31, 2021, at 10:00 p.m. to Tuesday, January 4, 2022, at 8:00 p.m. local time.

Ring in 2022 with a New Year’s event!

Trainers,
Happy 2020 from Slowpoke! Wait, no—it’s about to be 2022! Why is Slowpoke still wearing those glasses? At least Slowking got the memo! That’s right—our New Year’s celebration event is right around the corner! Look forward to Pokémon wearing new costumes, themed avatar items, the return of some familiar Pokémon wearing party hats, and a certain Shiny Pokémon will be appearing for the first time in Pokémon GO.

Pokémon GO New Years 2022

Friday, December 31, 2021, at 10:00 p.m. to Tuesday, January 4, 2022, at 8:00 p.m. local time

The Season of Heritage Story Continues!
Following the gift exchange, Spark decides to throw a party to celebrate and bring in the New Year!

Nearby Pokémon are intrigued by the festivities and drawn in to celebrate!

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

Fireworks!

To help bring in the new year, fireworks will appear in Pokémon GO from Friday, December 31, 2021, at 11:00 p.m. local time to Sunday, January 2, 2022, at 12:00 a.m. local time.

Event Bonuses

: 2× Hatch Stardust
: 2× Hatch Candy
: 1/2 Hatch Distance

Timed Research

To celebrate the New Year, you’ll be able to complete Timed Research featuring Pokémon appearing during this event.

Complete the research tasks to encounter various costumed Pokémon!

Costumed Pokémon

You’ll be able to encounter costumed Pokémon! New Year’s Hat Hoothoot and 2022 Glasses Slowking make their debut! Also, for the first time in Pokémon GO, you’ll be able to encounter a Shiny Hoothoot, if you’re lucky! You’ll be able to encounter noncostumed Shiny Hoothoot after the event ends.


: 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!

Raids

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!

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.

New Avatar Items and Stickers

The following new avatar items will be available to purchase in the in-game shop beginning with this event and will continue to be available after the event ends!

• 2022 Glasses
• New Year’s Headband
• New Year’s Jacket Set
• New Year’s Pants
• New Year’s Shoes

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

Please be aware of your surroundings and follow guidelines from local health authorities when playing Pokémon GO. Upcoming events are subject to change.

Source: https://pokemongolive.com/en/post/new-year-2022/