>>20308549It's honestly the Speed. 98 looks great on paper, but speed tiers matter a hell of a lot more than the actual numerical value. He gets outsped easily by very critical threats.
The fucker needs a boosting move. He's practically custom built to be using that. Amazing coverage, good uninvested defenses, the presence to force switches like crazy, and even Roost if need be. I'd say Quiver Dance, but it just needs a special DD equivalent, really.
The only major road-block is his STAB is fucked by Fairys, but that aside, something like that would add to his versatility.
That being said, he's still viable in OU. UU nowadays is basically OU#2.
Still, here's hoping for a Mega that patches his Speed.