Well, what do we have here...
I play with a NU team for 3 months, that was surprisingly effective on UU( REALLY effective is say, even with Cresselia and P-Z around.
That's my team:
Armaldo lead-a mix of Rhyperior and Cloyster. Rock Blast, Rapid Spin, Stealth Rock, good defense, and a better typing... it doesn't resist much types, but it also isn't weak to many. Before Rhyperior came to UU and Cloyster was discovered, it was THE lead.
Golduck: Decent speed for UU, CM, Encore. Kind of like offensuve Suicune without the bulk, but with Encore and Psychic. It is also one the better pokes to stop a Rain rampage thanks to Cloud Nine. It was chosen just because of that... but ended up being essencial to my team, being a special sweeper and a Encorer.
Scarf Primeape: one of the better revenge killers out there. Simple as that. Plays exactly like Flygon , dishing out powerful Close Combats and U-Turning many times. Also immune to sleep as a plus.
Entei: i use "Crotei". You won't believe how effective this set is. CM all the way up, walls things with a nice 115/85 defenses and possibly burning up things with Lava Plume, giving you a nice edge (Hitmontop Close Combat doing 17% when burned? Yeah), RestTalk away. Pressure adds up with everything.
Skuntank: Better Pursuit user IMO. Priority attack, Explosion, nice typing. Mismagius cries. Alakazam throws it's spoons in despair. Wrong Choiced pokes have no Choice at all.
Articuno: Subroost Moltres is annoying? So is Articuno. Moltres counts with a way better defensive typing, but Articuno has better defenses, and it Toxics what is meant to be Toxiced: bulky waters. Struggles with Registeel though, but Entei completely walls Regi, in a way that not even Explosion saves it (ironically), so...
The team hates Raikou and Haze Milotics... not everything is perfect.