I've been testing this team for a couple of days now, and it has around a 70% success rate on the OU ladder. Strangely enough however, i've only been in a single UU match with it, and my opponent left after Rotom crippled 3 of his/her pokemon in 4 turns. Because of this, I was hoping that some people experienced in UU could give me some advice. So without further ado, here they are:
Timid@Choice Scarf
252spe/252spa
Shadow Ball
Thunderbolt
Will-O-Wisp
Trick
The star of my team, and the reason it does so well in OU. Gengar lead? Better hope it's scarfed or sashed. Gyarados? I'll burn the inevitable ground or electivire switch-in. Weavile, T-Tar, Garchomp, Hippowdon? Burned. Bronzong, or Blissey switch-in? Trick scarfed. Obviously none of this applies in UU, but you get the idea of what I want to do with this thing. In addition to its crippling abilities, it can come in easily, is fast, and has an excellent double stab to work with.
Jolly@Leftovers
130hp/176atk/188spe
Leaf Blade
X-Scissor
Swords Dance
Baton Pass
The EVs give me 300 speed and 300 attack because i'm not sure what numbers to shoot for in UU. This is a great late game sweeper, although the enemy's Air Force must be shot down before it can be successful. One of the problems with this is that I almost never use baton pass, so that slot is basically open.
Timid@Choice Specs
Tinted Lens
252spe/252spa
Bug Buzz
Energy Ball
Psychic
Stun Spore
Buzz buzz buzz buzz buzz! Hello mosquito! Geek points if you know what I just said. This is the second star of my team, and like Rotom, it is one of the UU pokemon that works very well in OU. Bug Buzz 1 or 2HKOs practically anything in OU (heatran, blissey, snorlax, clefable are notable exceptions), so imagine how good this must be in UU! Stun Spore is a good 'fishing' move (throw it out there and see what you catch) in the early game. Energy Ball for Swampert, but I hear Gastrodon and Quagsire are quite popular in UU. Psychic can go pound sand if you can think of something better. I never use it.
Timid@Leftovers
252spe/252spa
Flamethrower
Energy Ball
Hypnosis
Nasty Plot
This guy can either kick serious ass or be hampered by poor type coverage (it is utterly walled by dragon and fire types). I'm not expecting too many of these in UU, so perhaps it isn't so much of a problem. Anyway, this is kind of like a special leafeon in that is is mostly a late game sweeper (read: after Rotom does its thing), but it can also come in and sleep a threat. Unfortunately, that threat almost always ends up being sleep talk heatran, but we're talking UU here.
Adamant@Leftovers
Dry Skin
252atk/252spe
Focus Punch
Cross Chop
Sucker Punch
Substitute
Me and tighty-whiteys here have a love-hate relationship. I want to say he's easily replaceable, but he's perfectly capable of sweeping entire teams. Even OU teams. He can either die instantly, or exterminate with extreme prejudice. At worst, hes completely unreliable, and at best, he's a loose cannon that gets the job done...sometimes. He's freaking incredible in the rain. I'll leave this one up to you, but I will say that sucker punch has saved my ass more times that I can count, and I can count pretty high. It's somewhere around the number 49 that I start to get confused.
Adamant@Leftovers
252hp/176def/82atk
Earthquake
Stone Edge
Stealth Rock
Rapid Spin
EVs listed give me 354 Hp, 281 atk, 300 def. This needs replacing, as he comes in, used stealth rock, and dies. Every once in a while he can catch salamence or something with a stone edge on the switch, but every once in a while isn't good enough. Of course, OU isn't UU, but i'm still looking elsewhere. Gastrodon perhaps. Suggestions please!
Well there you have it. Please let me know if i'm missing anything critical to UU play.

Timid@Choice Scarf
252spe/252spa
Shadow Ball
Thunderbolt
Will-O-Wisp
Trick
The star of my team, and the reason it does so well in OU. Gengar lead? Better hope it's scarfed or sashed. Gyarados? I'll burn the inevitable ground or electivire switch-in. Weavile, T-Tar, Garchomp, Hippowdon? Burned. Bronzong, or Blissey switch-in? Trick scarfed. Obviously none of this applies in UU, but you get the idea of what I want to do with this thing. In addition to its crippling abilities, it can come in easily, is fast, and has an excellent double stab to work with.

Jolly@Leftovers
130hp/176atk/188spe
Leaf Blade
X-Scissor
Swords Dance
Baton Pass
The EVs give me 300 speed and 300 attack because i'm not sure what numbers to shoot for in UU. This is a great late game sweeper, although the enemy's Air Force must be shot down before it can be successful. One of the problems with this is that I almost never use baton pass, so that slot is basically open.

Timid@Choice Specs
Tinted Lens
252spe/252spa
Bug Buzz
Energy Ball
Psychic
Stun Spore
Buzz buzz buzz buzz buzz! Hello mosquito! Geek points if you know what I just said. This is the second star of my team, and like Rotom, it is one of the UU pokemon that works very well in OU. Bug Buzz 1 or 2HKOs practically anything in OU (heatran, blissey, snorlax, clefable are notable exceptions), so imagine how good this must be in UU! Stun Spore is a good 'fishing' move (throw it out there and see what you catch) in the early game. Energy Ball for Swampert, but I hear Gastrodon and Quagsire are quite popular in UU. Psychic can go pound sand if you can think of something better. I never use it.

Timid@Leftovers
252spe/252spa
Flamethrower
Energy Ball
Hypnosis
Nasty Plot
This guy can either kick serious ass or be hampered by poor type coverage (it is utterly walled by dragon and fire types). I'm not expecting too many of these in UU, so perhaps it isn't so much of a problem. Anyway, this is kind of like a special leafeon in that is is mostly a late game sweeper (read: after Rotom does its thing), but it can also come in and sleep a threat. Unfortunately, that threat almost always ends up being sleep talk heatran, but we're talking UU here.

Adamant@Leftovers
Dry Skin
252atk/252spe
Focus Punch
Cross Chop
Sucker Punch
Substitute
Me and tighty-whiteys here have a love-hate relationship. I want to say he's easily replaceable, but he's perfectly capable of sweeping entire teams. Even OU teams. He can either die instantly, or exterminate with extreme prejudice. At worst, hes completely unreliable, and at best, he's a loose cannon that gets the job done...sometimes. He's freaking incredible in the rain. I'll leave this one up to you, but I will say that sucker punch has saved my ass more times that I can count, and I can count pretty high. It's somewhere around the number 49 that I start to get confused.

Adamant@Leftovers
252hp/176def/82atk
Earthquake
Stone Edge
Stealth Rock
Rapid Spin
EVs listed give me 354 Hp, 281 atk, 300 def. This needs replacing, as he comes in, used stealth rock, and dies. Every once in a while he can catch salamence or something with a stone edge on the switch, but every once in a while isn't good enough. Of course, OU isn't UU, but i'm still looking elsewhere. Gastrodon perhaps. Suggestions please!
Well there you have it. Please let me know if i'm missing anything critical to UU play.