In DC who can beat Legion (Xavicer's son) READ
I've read this guy from AVX and found that his strength above all the X-men (except X-Man Nate Grey and Onslaught)
Legion, the saint's mutant with billions power, the son of Professor X.
Crazy and multiple personalities, each personality strength. Psychic, fire control, time control, changing reality, etc.
Used to share the spirit of the Limbo gone to rescue Magik.
Legion has created a new universe, modify the Scarlet Witch's words: "No more mutant". He helped his father out paralyzed legs
My List: We limit the powers of Lucifer, the presence, spetre, ZH Parallax Hal, Anti Monitor, Superman Prime/ 1 milion
It should be Black Adam, only because I like anything with him in it.
The problem however is that Legions power-set and it's level is dependent on whatever personality is currently running the show.
So who can beat him depends on powers he is currently manifesting.