Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
This is an awesome Roserade set for the sun
EVs: 4HP 252Spa 252Spe
Nature: Modest
Item: Choice scarf
Moves:
Solarbeam
Weather Ball
Sludge Bomb
Leaf Storm
The Sun boosted weather ball really catches people off guard, the leaf storm is for the situations when you don't have sun up, also, it can...
I personally think that if we want to make this CAP a good Pokemon independently the only options are giving it Storm Drain or Water Absorb, we can't pick drought because it just makes a better Ninetales, and nobody wants that, also, though I agree that dry skin is the better option flavor-wise...