Niantic has announced the details for the December 2021 Community Day which takes place from Saturday, December 18th, 2021, from 11:00 a.m. to 5:00 p.m. local time and Sunday, December 19th, 2021, from 11:00 a.m. to 5:00 p.m. local time.

December Community Day features some familiar faces from 2020 and 2021!

Trainers, As we say goodbye to 2021, let’s take a look back at the Community Day events we shared together.

This year’s final Community Day event will be held on Saturday, December 18, 2021, and Sunday, December 19, 2021. Throughout the event, Pokémon featured in Community Day events throughout 2021 will be appearing more frequently in the wild, while Pokémon featured in Community Day events throughout 2020 will be hatching from Eggs and appearing in raids, so this event will be a great time for you to catch Pokémon featured in any Community Day events you may have missed!

December Community Day

Saturday, December 18, 2021, from 11:00 a.m. to 5:00 p.m. local time Sunday, December 19, 2021, from 11:00 a.m. to 5:00 p.m. local time

Event Bonuses

Incense activated during the event will last for three hours
Lure Modules activated during the event will last for three hours
1/2 Hatch Distance when Eggs are placed in an Incubator during the event
2× Catch XP
2× Catch Stardust

Special bonuses

From Friday, December 17, 2021, at 1:00 p.m. local time to Sunday December 19, 2021, at 11:59 p.m. local time

To celebrate the last Community Day event of the year, two additional bonuses will be available all weekend.

25% reduced stardust cost for trades
1 extra special trade per day

Pokémon Storage and Item Bag Cap Increase

To help you prepare for the biggest Community Day event of the year, the maximum amount that the Pokémon storage and Item Bag can be expanded to will be increased! Be sure to purchase Item Bag and Pokémon Storage expansions from the shop so you can stock up on Poké Balls and store all the Pokémon you’ll catch during December Community Day!

• Pokémon Storage Expansion Cap: 5,000 -> 5,500
• Item Bag Expansion Cap: 4,000 -> 4,500

This change will go into effect on Thursday, December 16, 2021 at 1:00 p.m. PST (GMT -8).

Wild Encounters

The following Pokémon featured during Community Day events in 2021 will be appearing more frequently in the wild. All Pokémon below will also be attracted to incense and lures regardless of what day it is.


* Eevee caught during the event will know Last Resort : If you’re lucky, you might encounter a Shiny one!

Eggs

The following Pokémon will be hatching from 2 km Eggs.


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

Raids

The following Pokémon featured in 2020 Community Days will be appearing in raids.


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

Exclusive Moves

The following exclusive moves will be available when evolving to the following Pokémon from Friday, December 17, 2021, at 10:00 a.m. to Monday, December 20, 2021, at 10:00 a.m. PST (GMT −8).

Special Research Story: December Community Day 2021

• For US$1.00 (or the equivalent pricing tier in your local currency), you’ll be able to access the December Community Day–exclusive Special Research story, December Community Day 2021.
• Stay tuned for when tickets for the December Community Day 2021 Special Research story go live!

Tickets are nonrefundable (subject to applicable law and the exceptions set forth in the Terms of Service). Please note that this Special Research will not include an in-game medal.

Timed Research

From Saturday, December 18, 2021, at 11:00 a.m. local time to Monday, December 20, 2021, at 10:00 a.m. local time

Timed Research will be available with tasks focused on all of the Pokémon that have been featured in Community Day events over the past two years!

Field Research Tasks

Friday, December 17, 2021, at 10:00 a.m. to Monday, December 20, 2021, at 10:00 a.m. PST (GMT −8)

Complete certain Field Research tasks to earn Mega Energy for the following Pokémon.

Event Bundles

Available from Friday, December 17, 2021, at 10:00 a.m. to Monday, December 20, 2021, at 10:00 a.m. PST (GMT −8)

• There’ll be a special one-time-purchase Community Day Box available for 1,280 PokéCoins, featuring 50 Ultra Balls, six Star Pieces, an Elite Fast TM, and an Elite Charged TM.
30 Ultra Balls will be available in the shop at no cost. Be sure to pick them up during this time!

As 2021 comes to an end, let’s look back on the memories we made during all the Community Day events this year. Don’t forget to share your experiences from this weekend on social media with #PokemonGOCommunityDay.

Let’s GO!

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/post/community-day-dec21/?hl=en