Trainers from all corners of the earth must work together to catch Pokémon during the Pokémon GO Fest Challenge Windows to unlock in-game bonuses and the chance for the first Legendary Pokémon to appear at Pokémon GO Fest.
If Trainers successfully defeat the Legendary Pokémon in Chicago, that Pokémon will start appearing in Raid Battles around the world after Pokémon GO Fest.
If you’ve been holding out for the appearance of Legendary Pokémon in Pokémon GO, prepare yourself for some collective effort this weekend.