At first glance I notice this team has a rather large fighting weakness.
Rhyperior - I don't see anything wrong with him, the only thing I have to say is that I prefer to come off gunning from the start. So I would go with a Rock Polish set, but there is nothing wrong with your set. If you want dat Rock Polish set here it is:
EVs: 252 Atk, 252 Spd, 4 Def
Ability: Solid Rock
Rock Polish gets you speed up to usable levels, and Earthquake and Stone Edge provide STAB EdgeQuake coverage. Megahorn is coverage.
Mismagius - Looks dandy, watch out for Bronzong.
Empoleon - I would suggest replacing Protect for Toxic, other than that looks good.
Roserade - Looks good, I notice that it (like all your other sets) are from smogon.
Hitmontop - Replace Stone Edge for Foresight, allowing you to Rapid Spin through the slew of ghosts in used in UU.
Houndoom - Looks nice.
It was kinda hard to rate since most of you sets were from Smogon