If you want to try to catch one of Pokémon Go’s strongest legendary Pokémon, then you’ll need to act fast.

Mewtwo, who’s been in legendary raids for the past few weeks, is set to leave the game tomorrow and return to being an EX Raid exclusive Pokémon. EX Raids are special raids that can only be joined through random invites.

Mewtwo’s departure means there won’t be any legendary Pokémon left to face in raids. Niantic hasn’t confirmed which creature will replace Mewtwo, but with the recent release of Sinnoh Pokémon, Niantic could potentially look to offer Dialga or another legendary beast from the fourth generation.

If you want to catch Mewtwo, you’ll need to gather a team of at least 10 trainers to help you on your quest. Mewtwo is incredibly powerful, so there’s no way you can face it alone.

You should also create a team of strong Bug, Dark, and Ghost-type Pokémon to give you a better chance of dealing massive damage to Mewtwo. After that, you’ll need to hope you’re successful in catching the Pokémon, or else you’ll have to find another location where Mewtwo resides and take it down once again to have another shot at capturing it.