Pokémon Go' Adventure Week: Research Tasks, Egg Pools and Raid Updates

Fossil Pokémon are most of the rewards for completing the new Research Tasks.

Adventure Week: All you need to know & let's discuss! - megathread

Adventure Week: All you need to know & let's discuss! - GO Hub Forum

Out to Play (Pokémon GO Event Guide)

Noxious Swamp - All you need to know & let's discuss! - megathread

Pokemon Go June Field Research tasks, rewards and breakthrough

Adventure Week 2022 Event Overview (LegendsLima) : r/TheSilphRoad

Out to Play (Pokémon GO Event Guide)

Pokemon Go Roxas 2021

Research tasks, Pokémon GO Wiki