Now, I know this is difficult to do in UU, but this is a set that I've been messing around with to great effect:
Chansey @ Eviolite
252 Def/252 SpDef/4 Spe
Bold(Calm) / Natural Cure
Toxic
Seismic Toss
Softboiled
Snatch
This is kind of a mixed wall, anti-setup pokemon. You can have all kinds of fun with this, though some of chansey's rarer 'counters' like subseeders will still get the jump on you. It also lets chansey outstall anything on a stall team 1v1, including other Chansey/Blissey. Even Aromatherapy types, because snatch steals it and has 16 PP.