Slowking has been the best pokemon in RU for more time than any other pokemon and it's not even close. That's mostly because enough mons can beat it in enough ways that it's never been broken, but still. It has like 12 different sets (defensive, dtail, cm 2 attacks, cm twave, cm iron defense, np 2 attacks, np 3 attacks, np tr, tr 2 attacks, tr 3 attacks, lo 3 attacks, specs... i haven't tested cm twave or tr 2 attacks but both seem decent. oh well.) that it can run viably simply because it has amazing typing, bulk, and most of all regenerator. It's just... so good. I've said before that you can fit slowking on any team because it's true, it can do so much that it's never going to be dead weight.