bugmaniacbob
Was fun while it lasted
I don't see why you think this is such a bad thing, or even why adding one more Pokemon that happens to be affected by weather (which is true of nearly any Pokemon in OU) will suddenly make weather the only viable option. Personally I consider Dry Skin to be more balanced than Water Absorb simply because it does have a disadvantage - namely, it prevents CAP3 from really checking both Sun and Rain at the same time.I am strongly opposed to Dry Skin because it is so affected by weather. If CAP3 did hypothetically have Dry Skin, it would only compound OU battles even more into who controls the weather. In weather vs weather battles it becomes even more important to win your weather war because if Sun wins out then CAP3 will likely be dead weight because of the ridiculous residual damage it would be taking. If you use it on a weatherless team then it's another Pokemon that's completely at the mercy of your opponent's weather. If they use Rain then great but CAP3 loses an STAB, if they use Sand then CAP3 is a little bit screwed, and if they use Sun then CAP3 is completely deadweight because two switch ins with SR and Dry Skin damage will near enough kill it.
Another reason I consider Dry Skin to be superior to Water Absorb is that it gives it an advantage to actually being used on rain teams as opposed to against them, since it is gaining HP in rain and can take down Celebi, Ferrothorn, and opposing Water-types (likely as not), as well as being an emergency check to sun teams, as, even if it is losing HP in sunlight, it is still getting the boost to its Fire-type attacks, so it's not total dead weight.
Nobody said Dry Skin had to be its only ability. It seems to me to be a good idea that, if you wanted to use this on a sun team, you would have to forego the Water immunity, given how powerful this thing is likely to be. I also fail to see how Dry Skin is merely "a means of getting rid of the Stealth Rock weakness" when its primary purpose is to make CAP3 effective in combating Water-types. Moreover, don't assume that it will be useless simply because its Fire-type STAB is less effective. Volcarona makes a very effective rain abuser, I'm told, despite its weakening of its main STAB. We could quite easily manipulateI'm opposed to Dry skin as i think its Fire STAB will be much jeopardized: nobody will use it under sun, which squanders the 1.5 bonus of its Fire-moves, while in rain, well i agree Fire is still useful for detering Ferrothorn, but still this means being walled by Jirachi, Bronzong, and even to a certain extent Gengar! All of which are not designed to be counters/checks in the first place. Defensively speaking Dry skin is just a means of getting rid of the stealth rock weakness, which is another way of sneaking around the typing instead of using it. therefore this poke will be used in spite of its Fire-type, which is exactly what we want to avoid.
As far as Drought is concerned I am more or less ambivalent; I consider Dry Skin to be superior as I do want to see this thing used on rain teams as well as against them, since this gives it a reason to use its Poison-type STAB more. I'm not fond of it, but I can see why others might like or dislike it (also I've been toying with the idea of a Fire-type Drought/Dry Skin Pokemon since the typing stages, and I'll admit it intrigues me).