Meh, I'd rather run natural cure altaria tbh, status is a lot more common than weather, but if you were running heal bell support altaria than cloud nine would be better (is cloud nine even legal with heal bell though?)
Altaria is pretty good right now imo, not a whole lot is running hp:ice since special attackers would rather hit golem and quagsire harder than altaria. I've been using the bulky DDance set and it's been working really well although the Choice Specs and the support set do seem cool.
Also SD Victreebel even outside of sun is a beast, with STAB leaf blade and a fighting resist he can just walk all over bulky gurduur a lot of people rely on to stop physical sweepers. Sleep powder is also really good, but if i see 1 more tangela i swear im gonna start running sludge bomb.