Pokémon Go’s Raid Battles are like gyms on hard mode. A group of players work together to take down this Boss Pokémon in the hopes of earning some special items and maybe even catch the Pokémon. The main appeal of Raid Battles is that you can participate in them with your friends — up to 20 of them! There’s no difference to how Raid Battles work mechanically than typical gym battles. If you and your party manage to wipe the floor with that Boss Pokémon, you’ll get some goods.