Seriously though, kids. Since Nightcrawler is more likely to retreat than commit cold blooded murder, I really don't think people should have spent this much time talking about it. With the exception of Joseph/Magneto, I don't see anyone but the psychics being able to pull off a win more than a few times out of ten.
Jean Grey (sorry, but with her TK, she could hold Hulk off long enough to put him down) could pull it off. Cable, with T-O virus but after he beat Nate Grey, could pull it off so long as his powers weren't being disrupted like in the Onslaught saga and after he got rid of the virus, he definitely could. Professor X could do it, I think. Like AC said, he's a cripple in a chair. In this one case, the fact that Hulk is SO damned formidable would be a disadvatage for him. It would mean that Xavier would throw everything in his arsenal at Hulk out of sheer fear. Do not pass GO, do not collect 200 dollar, go straight to utter mind rapage. I don't mention Nate Grey because I'm fairly sure that he was never a part of the Xmen, even though he appeared in their comic quite a bit.