[Roll]

Trust me, Piccolo, throwing water on Pheonix is not going to do anything at all. Judging by her appearance in the Episodes, she has enough power with mind control to surpass Xavier's even with Cerebro linked with him. Pheonix could just fly over all of the DBZ characters and control them with her mind power.
Then there is Apocalypse. He has the ability to change his body into anything, a drill, a hammer, etc. His strength and technique can get at any DBZ fighter.
Plus, cannonball can withstand damage while using his powers. Surprising as it is, this happens to be true (and I find it wierd) .
Let's not forget Mystiques ability to change into another being, which is so precise, everything is exactly the same. She could change into Goku, and they would have to kill one of them to to try and get rid of her... although, I'm not sure if she could duplicate the power readings.
Emma Frost is also essential to the battle. Along with the ability to become somewhat invincible with one of her powers intact, she can manipulate the minds of others to make them change their thought of what to do. This could effect the battle in a lot of ways.
Then Juggernaut. he could win the battle, as he is unsusceptible to Physical attacks of any kind, and can never be stopped in his pace, but only be slowed down. He is only affected by psiotic attack but only with his helmet off.
Mr. Sinister is immortal due to his genius in biotics and genetics. He is able to rearrange his molecules to change his shape, size, appearance, everything, and has superhuman strength along with an accelerated healing factor.

If you need more people to agrue about, I've gots a list. I just don't want you all to get bored.