IMO , Hydration / Rain Stall Goodra isn't very viable on its own. However, if your team is based around rain and you already have 1-2 rain setters, then that set is pretty good. You should probably replace Rain Dance with something else though.
If you aren't using a rain team, go for the Assault Vest Goodra.
A few suggestions on the set though:
- Fire Blast > Flamethrower for immediate power
- You could also replace Ice Beam with Muddy Water for better coverage (but it's your choice).