Today Niantic announced that the long-awaited release of legendary pokémon in Pokémon Go is coming soon. The studio provided some details on how the feature will play out in-game. Players will have to work together to defeat the rare monsters using the game’s new cooperative raids feature, which was introduced last month.

“Once in the wild, trainers can search for unique legendary eggs at gym locations around the world,” the company explains. “Players can team up with friends and other trainers to join legendary raid battle to defeat the legendary pokémon and earn a chance to catch it.”

The feature will make its debut very soon; the first legendary pokémon raid will take place during Pokémon Go Fest in Chicago on July 22nd. If players in Chicago manage to defeat the monster, legendary raid battles will then start rolling out globally on the 23rd.