List of Raid Bosses changes

From the launch of Raid Battle, until now, there were many changes to Raid Boss pool and their tier. Usually, a new Legendary Raid Boss or events update the whole pool in order to match a specific theme.

June 23rd
The launch of Raid Battle included tier 1 to 4 Bosses.

July 22nd
The first Legendary Pokémon Articuno and Lugia were released in tier 5 Raid Battles.

July 31st
Moltres replaced Articuno.

August 7th
Zapdos replaced Moltres.

August 13th
All Legendary Birds along with Lugia were available until the end of the month.

August 14th
Mewtwo was released in EX Raid Battle only.

August 31st
The Legendary Beasts Raikou, Entei and Suicune took place of tier 5 raids. They were exclusive to specific region each month and switched locations at the beginning of each month.

November 4th
Tier 1 to 4 Raid Bosses were updated for the first time.