what i did, is i would use my shoot ability and get close to him and then stop for a split second and buster him, but it is hard and also the buster he can break out of it, usaully when u rapidly tap either Y or B u can hurt him for a decent amount if u are lucky devil trigger is useful aswell, but if u are having problem during dante fight, sanctus fight is no walk in the part either im still stuck on him