Niantic opened the Raid Battle mode for all the Level 20 and higher players in the Pokemon GO according to the latest Twitter message of the Pokemon GO Japan. You can try the new Raid Battle mode on the iOS and on the Android version of the game too.

The Raid Battle mode is a new co-op gameplay mode where up to 20 players can play together against a migthy Pokemon. Until now this mode was available only at the selected gyms but now you can enjoy it at all.