There's currently no way to get rid of weather conditions in OU without introducing a new one yourself. If there was a decent Pokemon with the Cloud Nine ability, then weather might not be able to dominate so easily. --- ....because shutup. R - Hyuck hyuck hyuck!
Why not just an attack that ends weather conditions?
This too, but since abilities immediately activate it wouldn't use up a turn.
The issue with Cloud Nine is the weather resumes as soon as your Poke switches out. My idea would be an attack version of Air Lock. --- Not changing this sig until we get a new main series Tales game released on a Nintendo console in the US