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. Visit the following pages for detailed information of each change:
For the currently active Raid Bosses, see List of current Raid Bosses.
The table below records all Pokémon which had been a Raid Boss at least once. Croconaw, Gengar, Breloom, Alolan Exeggutor, Feebas, Granbull, Misdreavus, Umbreon, Lileep, Anorith, Quilava, Yanma, Tangela, Ivysaur, Charmeleon, Wartortle, Raichu, Staraptor, Chansey, Miltank, Lickitung, Pinsir, Abomasnow, Mantine, Wobbuffet, Machamp, Combee, Medicham, Cranidos, Croagunk, Bronzong, Masquerain, Skorupi, Drifloon, Pidgeot, Tentacruel, Weezing, Hippopotas and Vibrava experienced tier change.