In Yo-kai Watch 2, Zerberker is one of the Yokai required to unlock Komashura.
He looks much like Snartle, with a more reddish color scheme. He shows almost only rage. He can make others explode with rage whenever he's around. He is also generally powerful, having great strength.
One way to befriend Zerberker is to complete the post-game quest "An Offered Sword", which is given by the old lady visiting the Fortune Hospital in Downtown Springdale during daytime. Obtain a Betrayed Blade by defeating White Reuknights at Hooligan Road in the Yo-kai World, then go to the graveyard behind the Shoten Temple at night, and give Zerberker his lost sword. He will then fight the player and join the player automatically once they defeat him.
Alternatively, Zerberker appears in the 7th Circle of Infinite Inferno.