The newest Pokémon GO Raid Boss is a long-awaited challenger—the Legendary Pokémon Mewtwo is finally available outside of EX Raids. Mewtwo is one of the most powerful combatants in the world of Pokémon, so this is an opportunity you won’t want to miss. Get out there and challenge it before it stops appearing as a Raid Boss on October 23 at 1:00 p.m. PDT. And bring your friends along with you when you do—you may earn some extra Premier Balls thanks to a recent update. You’ll only be able to use the Premier Balls you earn from defeating Mewtwo to catch it, so it’s crucial to be prepared. Try to take over the Gym before the Raid starts, battle alongside your friends, and pick Pokémon that will perform well in battle to maximize your chances.