>>18596384Swift Swim isn't banned, but he's still a pretty sucky swift swimmer because his STAB isn't boosted in rain.
If you want Swift Swimmers there's really no point in not using Kingdra, Omastar, Ludicolo and Kabutops over pretty much anything else.. Beartic would be a bit better if it had a little more speed and a secondary water typing, to put it on par with the other swimmers.