So I decided to make a UU team with my favourite type, Poison. I've won 7/10 battles (lost one due to fire blast missing 3 times) which is pretty good, considering I'm only using one type. Anyway here we go:

Crobat (F) @ Choice Band
Trait: Inner Focus
EVs: 252 Atk / 4 Def / 252 Spd
Adamant Nature (+Atk, -SAtk)
- Brave Bird
- Zen Headbutt
- U-turn
- Pursuit
Crobat with a Choice Band catched people expecting the standard stall breaker set off guard. Inner Focus, usually useless, actually helps me KO unsuspecting Fake Out leads such as Ambipom and Mienshao. Brave Bird is STAB. U-turn is great on choice users for scouting. Zen Headbutt is for lack of a better move, and Pursuit is to catch those fleeing Ghosts.

Muk (M) @ Leftovers
Trait: Sticky Hold
EVs: 252 HP / 60 Atk / 196 SDef
Careful Nature (+SDef, -SAtk)
- Curse
- Poison Jab
- Ice Punch
- Brick Break
Muk makes a great special hit absorber, even in higher tiers. I can come in on a Zapdos for example, get in a few Curses, and then do some work. Poison Jab is STAB. Ice Punch is for Gligar specifically, as otherwise it walls me. Brick Break covers Steel types, among others. Sticky Hold is a great ability, as it stops me being Tricked a Choice item making me useless.

Nidoking (M) @ Life Orb
Trait: Sheer Force
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Earth Power
- Ice Beam
- Thunderbolt
- Sludge Wave
Nidoking is a monster with Sheer Force, and apparently it cancels out Life Orb recoil as well! Earth Power and Sludge Wave are STAB, and both boosted by SF. These two and Ice Beam give me pretty perfect coverage already, but I had an empty moveslot and Thunderbolt is nice for Milotic and other bulky waters.

Weezing (M) @ Black Sludge
Trait: Levitate
EVs: 252 HP / 132 Def / 24 SAtk / 100 SDef
Bold Nature (+Def, -Atk)
- Will-O-Wisp
- Clear Smog
- Fire Blast
- Stockpile
Weezing is my physical wall. Oh my god I love this pokemon. He has amazing defense, and counters so many threats in UU - Mienshao, Scrafty, Heracross and more. Will-O-Wisp cripples most physical attackers, although I have to be careful of Guts users switching in. Clear Smog is STAB with a brilliant effect meaning nobody but Steel types can set up on me. Fortunately, I have Fire Blast for them. Stockpile is the icing on the cake, making me unbreakable after a few boosts.

Venomoth (F) @ Black Sludge
Trait: Tinted Lens
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Sleep Powder
- Quiver Dance
- Bug Buzz
- Baton Pass
Venomoth is an interesting pokemon. I put something to sleep, set up some Quiver Dances, then proceed to sweep with Bug Buzz, which gets nice coverage on its own with Tinted Lens. Once my opponent has worn me down too much, I just baton pass out to Nidoking and continue my sweep.

Skuntank (F) @ Life Orb
Trait: Aftermath
EVs: 32 HP / 252 Atk / 224 Spd
Jolly Nature (+Spd, -SAtk)
- Taunt
- Sucker Punch
- Crunch
- Pursuit
Skuntank helps my team out loads. He gets rid of my Psychic weakness with his excellent secondary typing. He can trap and kill any Psychic or Ghost type that my team is having problems with. 224 Speed EVs with a Jolly nature let me outspeed Timid Chandelure and finish it off with either Crunch or Pursuit. Taunt stops Substitute shenanigans and lets me freely Sucker Punch. It may seem strange to have no alternative STAB move but all of these moves fill specific roles, and my team is not exactly lacking in Grass-type coverage.