An all out battle who would win?
Van kleiss from generator rex.
Well you know Ben 10.
I say Kleiss.
Replies here because of posting limit.
Van Kleiss gained the ability to create E.V.O.s.
Also I dont think he needs a supply since he can turn any organic matter into a slave evo.
Remember that episode where he went to past and turned a lion into a powerful evo.