The NJPW Junior Heavyweight title (and jr. Tag) has a weight limit of 100 kg, similarly Wwe’s old Cruiserweight had a 205 lbs. limit. I was thinking that could be an interesting story if someone won it when he was under the limit than at some future time the whiny heel who can’t beat 'em gets him weighed and sure enough he’s overweight.
I don’t remember anything like that happening, but I’m no wrestling historian.
I recall AEW used to do weigh-ins but I didn’t recall any of their titles actually having weight limits.
Come to think of it I’m not sure how they’d handle that if it happened in boxing or MMA either.
If I remember, someone (I wanna say Matt Hardy?) won the Light Heavyweight/Cruiserweight title at one point, and the whole gimmick was people questioning his weight and him avoiding scales, etc
In combat sports usually if a champ doesn’t make weight before the fight they either a) have to drop it or b) make a deal with the challenger that they get more of the purse to risk getting put in a coma by someone 15 pounds heavier than them, depending on the promotion