If there was one Pokemon that I think could do a lot as far as being underrated and such, I'd nominate Poliwrath in OU...
...I know what you're thinking, I'm nuts right? His dual STABs are useful: Water easily picks Pokemon like Gliscor and Hippowdon while Brick Break hits many different types as well for Super Effective damage (think Dark and Steel-types). Defensively he's a decent Tyranitar and Gyarados counter and still that's saying a lot (Swampert can't take STAB Crunches too well and he isn't immune to Waterfall from Gyarados). Only problem is is that you need Rock Slide to really pull off the rest of this... but still Water Absorb is an awesome ability and his balanced stats allow him to take hits as well as deliver some back with a decent punch. Too bad that he really needs a Bulk Up boost to get going but Substitute and Hypnosis help that a lot.
I dunno, maybe I'm just a big Poliwrath fan and I wish I could build a team with it in OU... if only I could figure out a set that works best (Belly Drummer vs. maybe one of the Bulk Up sets) and had a bit more of a knack for making teams. >_>;
...I know what you're thinking, I'm nuts right? His dual STABs are useful: Water easily picks Pokemon like Gliscor and Hippowdon while Brick Break hits many different types as well for Super Effective damage (think Dark and Steel-types). Defensively he's a decent Tyranitar and Gyarados counter and still that's saying a lot (Swampert can't take STAB Crunches too well and he isn't immune to Waterfall from Gyarados). Only problem is is that you need Rock Slide to really pull off the rest of this... but still Water Absorb is an awesome ability and his balanced stats allow him to take hits as well as deliver some back with a decent punch. Too bad that he really needs a Bulk Up boost to get going but Substitute and Hypnosis help that a lot.
I dunno, maybe I'm just a big Poliwrath fan and I wish I could build a team with it in OU... if only I could figure out a set that works best (Belly Drummer vs. maybe one of the Bulk Up sets) and had a bit more of a knack for making teams. >_>;