List of Raid Bosses changes/2021

This page is the list of changes of Raid Bosses occurred in 2021.

In this year, Burn and Douse Drive Genesect, Therian Forme of Thundurus, Tornadus and Landorus, Xerneas, Yveltal, Zacian and Zamazenta were introduced.

January 1st
The New Year's 2021 featured different Raid Bosses.

Ho-Oh returned and the Mega pool was changed at 1 p.m. PST.

January 5th
The Unova Celebration Event featured Unova Raid Bosses, including the debut of Burn Drive Genesect.

January 12th
The Sinnoh Celebration Event featured Sinnoh Raid Bosses.

January 19th
The Hoenn Celebration Event featured Hoenn Raid Bosses. Mega Ampharos was introduced.

January 26th
The Johto Celebration Event featured Johto Raid Bosses.

January 31st
Raikou replaced Entei.

February 2nd
The Team GO Rocket Celebration featured Dark- and Poison-type Raid Bosses.

February 4th
Suicune replaced Raikou.

February 8th
Raid Bosses returned to Johto set after Team GO Rocket Celebration.

February 9th
The Lunar New Year 2021 featured different Raid Bosses. Latias and Latios returned and Mega Gyarados was introduced.

February 14th
Valentine's Day 2021 featured different Raid Bosses.

February 19th
Raid Bosses returned the Lunar New Year set after Valentine's Day.

February 20th
The Pokémon GO Tour: Kanto featured only Snorlax, Kanto region-exclusive Pokémon and Legendary Pokémon.

February 21st
The Kanto Celebration Event featured Kanto Raid Bosses.

February 23rd
The Kanto region-exclusive Pokémon were available in their respective regions from February to March.

March 1st
Landorus returned with shiny variant available. Mainly the types of tier 1 and 3 Raid Bosses are strong against Landorus.

March 6th
Tornadus returned with shiny variant available. Mainly the types of tier 1 and 3 Raid Bosses are strong against Tornadus.

March 9th
Searching for Legends featured different Raid Bosses.

March 11th
Thundurus returned with shiny variant available.

March 14th
Mainly the types of tier 1 and 3 Raid Bosses are strong against Thundurus in the set after Searching for Legends.

March 16th
Charge Up featured different Raid Bosses, including the debut of Therian Thundurus.

March 23rd
Raid Bosses returned to previous layout of Thundurus after Charge Up.

March 24th
Weather Week featured different Raid Bosses.

March 27th
Special Raid Weekend featured Rayquaza that knew Hurricane.

March 29th
Rayquaza left.

March 30th
Therian Tornadus became available. Mainly the types of tier 1 and 3 Raid Bosses are strong against Tornadus.

April 4th
Spring into Spring 2021 featured different Raid Bosses.

April 9th
Raid Bosses returned to previous layout of Tornadus after Spring into Spring.

April 13th
Rivals' Week featured different Raid Bosses, including the debut of Therian Landorus.

April 19th
Mainly the types of tier 1 and 3 Raid Bosses are strong against Landorus in the set after Rivals Week.

April 20th
Sustainability Week 2021 featured different Raid Bosses.

April 26th
Raid Bosses returned to previous layout of Landorus after Sustainability Week.

April 27th
Incarnate Forme of the Forces of Nature returned.

April 29th
New Pokémon Snap Celebration featured different Raid Bosses.

May 3rd
Raid Bosses returned to previous layout of the Forces of Nature after New Pokémon Snap Celebration.

May 4th
Luminous Legends X featured different Raid Bosses, including the debut of Xerneas.

May 11th
Pancham was added and Galarian Ponyta can be shiny in the second part of Luminous Legends X.

May 15th
Mega Altaria was released after the end of May 2021 Community Day.

May 18th
Luminous Legends Y featured different Raid Bosses, including the debut of Yveltal.

May 25th
The second part of Luminous Legends Y featured different Raid Bosses.

June 1st
The Legendary Titans returned.

June 8th
A Very Slow Discovery featured different Raid Bosses, along with the release of Mega Slowbro.

June 14th
Raid Bosses returned to previous layout after A Very Slow Discovery.

June 17th
Summer Solstice 2021 featured different Raid Bosses, along with the release of shiny Regigigas. Yanma, Petilil, Alolan Raichu, Alolan Marowak and Floatzel were only available in the Eastern Hemisphere. Snorunt, Snover, Lapras, Piloswine and Walrein were only available in the Western Hemisphere.

June 21st
Mainly the types of tier 1 and 3 Raid Bosses are strong against Regigigas in the set after Summer Solstice.

June 25th
Bidoof was added in Bidoof Breakout.

July 1st
All tiers of raids on Bidoof Day were replaced with Bidoof.

July 2nd
Deoxys Defense returned. Mainly the types of tier 1 and 3 Raid Bosses are strong against Deoxys.

July 6th
5th Anniversary featured different Tier 1 Raid Bosses.

July 16th
Mewtwo returned. Mainly the types of tier 1 and 3 Raid Bosses are strong against Mewtwo.

July 17th
Day 1 of Pokémon GO Fest 2021 featured different Tier 1 and 3 Raid Bosses.

July 18th
Day 2 of Pokémon GO Fest 2021 featured all released Legendary Pokémon (at least one form) in Tier 5 Raids.

July 19th
Raid Bosses returned to previous layout after Pokémon GO Fest 2021.

July 23rd
Ultra Unlock Part 1: Time featured different Raid Bosses.

August 6th
Ultra Unlock Part 2: Space featured different Raid Bosses.

August 20th
Ultra Unlock Part 3: Sword and Shield featured different Raid Bosses, including the debut of Zacian.

August 26th
Part 2 of Ultra Unlock Part 3: Sword and Shield featured different Raid Bosses, including the debut of Zamazenta.

September 1st
Lugia returned.

September 8th
Psychic Spectacular 2021 featured different Raid Bosses.

September
Uxie, Mesprit and Azelf returned with shiny variants available.

September 21st
Fashion Week 2021 featured different Raid Bosses.

September
Raid Bosses returned to previous layout after Fashion Week.

October 1st
Douse Drive Genesect became available. Secrets of the Jungle Event 2021 featured different Raid Bosses.

October 11th
Raid Bosses turned to a layout of mainly the types of tier 1 and 3 Raid Bosses are strong against Genesect after Secrets of the Jungle Event 2021.

October 12th
Altered Giratina returned. Mainly the types of tier 1 and 3 Raid Bosses are strong against Giratina.

October 15th
Halloween 2021 featured different Raid Bosses.

October 22nd
The second part of Halloween 2021 featured different Raid Bosses.

November 1st
Raid Bosses turned to a layout of mainly the types of tier 1 and 3 Raid Bosses are strong against Darkrai after Halloween.

November 5th
Festival of Lights featured different Raid Bosses.

November 15th
Raid Bosses changed after Festival of Lights.

November 16th
Pokémon BD & SP Event featured different Raid Bosses.

November 18th
The second part of Pokémon BD & SP Event featured different Raid Bosses.

November 22nd
Raid bosses changed after Pokémon BD & SP Event.

December 1st
Reshiram and Zekrom returned with shiny variants available. Mega Steelix was also introduced.

December 7th
Dragonspiral Descent featured different Raid Bosses.

December 13th
Raid Bosses returned to previous layout after Dragonspiral Descent.

December 16th
Part 1 of Holiday 2021 featured different Raid Bosses.

December 18th
The Tier 1 consisted of the Pokémon from the December 2020 Community Days during the December 2021 Community Day.

December 23rd
Part 2 of Holiday 2021 featured different Raid Bosses.