@Almighty_Darkseid: @imbackwimps said:
here we go again with everybody's fav dc fanboy that dont know anything about comics Onslaught possessed the combined abilities of Professor X, Magneto, Franklin Richards, and X-Man, including telepathy, telekinesis, astral projection, illusion creation, mental bolt projection, sensing mutant presences, manipulating magnetic fields, and affecting reality itself. Onslaught could also enhance its physical size and strength. with all that ONSLAUGHT WINS EASY
More on Marvel.com: http://marvel.com/universe/Onslaught_(entity)#ixzz1yVpVq51z
You forgot one very important thing. Onslaught can not be killed or harmed by physical means. At all, it takes very high level energy manipulate to hurt him. As was displayed when Onslaught was resurrected from the negative zone. Also Onslaught can also create outshoots of himself as he did when he created Female Bucky to bring him back from the negative zone. CSuperman and Doomsday have no way of winning this fight, unless you give them some form of lantern rings, and even then it would still be very hard for them to do anything to Onslaught without great skill in using the rings.