Seven Deadly Sins
~hallelujah~
CMKou only ran HP Water in UU because its main counters were:well in that case run hp fighting, how often do you see pert outside of the lead slot, if it is a lead it should be weak enough to die from a calm mind shadow ball, if not you should be switching if you have no boosts.
Or better yet update shoddy with aura sphere so it can be OU again!
The idea is HP water hurts switch in's more reliable so you can finish them off with a calm mind Shadow ball. Does Grass do anything other than kill swampert?
- Rhyperior, which is 4x weak to Water
- Steelix, which is neutral to both Grass and Ice
- Camerupt, which is also neutral to both Grass and Ice
Since none of those factors are present here in OU, HP Water is uninteresting. Also, how are you hitting things with a CM Shadow Ball if they're switching into HP Water?
That said, I'd support HP Ice over HP Grass. It makes you less screwed against Shaymin, which is becoming all too common, and also hits Flygon, Dragonite, and has pretty solid coverage in general.