Freddy's weakness is changed in every movie so it's a bit inconsistent
holy water has beat him
physical attacks for the most part (nightmare on elmstreet 4)
not being afraid of him
also Freddy fears fire a bit because that's how he died.
I'm just going to say a team of x-men go in and beat his ass down.
Just think of it, stupid teenage kids from the 80's go in and kick his at the end of every movie, and horror movie characters are some of the most brainless people out there. If 80's teenagers can beat him than any comic book character could KO him or kill him, no problem at all. Freddy is a bitch when he's not fighting a 17 year old.