Well, after getting back into UU last week or so, I achieved an average ranking of around 1275. I was planning on making this team for getting onto the leader-board, and I was hoping the people on Smogon could help me find any mishaps.
This team is fairly balanced, as most UU teams are, and is fairly easy to use. The team members all have key resistances as well, which makes prediction and switching a breeze, or so I thought. This team has about a 75% win ratio, and never really wins by hax. The high win ratio might make you think I'm not telling the truth, but it was a crowded time, so I could have been facing lesser players. Whatever.
The strategy is this: Cripple opponents with Banette and Clefable, and come in on hits with my teams resistances. The 3 sweepers often don't come out until late game, so they can sweep easier. Steelix is a bit of an oddball, but is a must in all UU teams. Now, the team itself.
Banette (M) @ Choice Scarf
Ability: Insomnia
EVs: 204 HP/90 Atk/216 Spe
Jolly nature (+Spe, -SpA)
-Trick
-Wil-o-wisp
-Thunder Wave
-Shadow Claw
Description: skiddle's Banette lead. Tricks a Choice Scarf onto wall leads like Steelix or Claydol, and then proceeds to double status. Electrode and Miltank leads are it's only problem. Wil-o-wisps first, and proceeds to Thunder Wave sweepers. Shadow Claw deals with Claydol, Drifblim, Rotom, and Mr. Mime leads.
EVs: These EVs allow for Banette to get to 363 speed with the Scarf, 263 without it. The HP EVs allow for minimum Stealth Rock damage, and Banette can live through most hits. Attack EVs for Shadow Claw to hopefully do something.
Team Work: Lot of it. Banette gives me a great start by giving Venusaur and Hitmonlee paralyzed opponents, and Wil-o-wisp allows for safer switch-ins. Tricking a Scarf onto Clefable also just destroys it. Banette can also come back in on Close Combats for more crippling.
Clefable (M) @ Leftovers
Ability: Magic Guard
EVs: 252 HP/252 SpD/6 Def
Calm nature (+SpD, -Att)
-Thunder Wave
-Encore
-Seismic Toss
-Softboiled
Description: This Clefable fits best with my team's strategy by just messing up my opponent's. Thunder Wave to support my sweepers, and Encore for safe switches. Counters almost every special threat in UU. Seismic Toss to out-stall Miltank and friends. Most of the time, people anticipate Calm-Clefable, which is a big mistake.
EVs: Max Special Defense to take two Specs/LO Ice Beams from Glaceon, and two Leaf Storms from a Specs-Saur. No Defense EVs needed, because this Clefable isn't meant for mixed walling, unlike the analysis says.
Team Work: Pairs well with Banette to be able to screw over my opponent's team. If I encore a Ninetales' Flamethrower, I switch to my Ninetales to get a free Nasty Plot. Encore also works with my team's "resistance" strategy.
Steelix (M) @ Leftovers
Ability: Sturdy
EVs: 252 HP/120 Att/136 SpD
Brave nature (+Atk, -Spe)
-Stealth Rock
-Earthquake
-Gyro Ball
-Roar
Description: The most used Pokemon in the UU metagame, happens to be on my team. Steelix is bog-standard, and so is the set. Sets up Stealth Rock, and Roars away things. Earthquake and Gyro Ball for STAB and coverage. Takes hits like a man.
EVs: Max HP, and put the rest in Special Defense to survive weak attacks. Attack EVs to actually hurt something. 0 Speed IV and Brave for Gyro Ball's power.
Team Work: Takes hits for the entire team, and counters a hell lotta Pokemon. Setting up Stealth rock helps Clefable and Banette with their Status shuffle.
Ninetales (M) @ Life Orb
Ability: Flash Fire
EVs: 252 SpA/6 HP/252 Spe
Timid nature (+Spe, -Att)
-Nasty Plot
-Flamethrower
-Energy Ball
-Hidden Power Rock
Description: Almost nothing can take a Flash Fire x2 LO Flamethrower, which this guy often gets. Come in on a Fire move, and Nasty Plot up, then sweep with good coverage. Hidden Power Rock counters Altaria and other Ninetales, and rounds out the coverage on this set.
EVs: Max Special Attack and Speed to outpace and OHKO most things. Timid over Modest to win the speed tie with other Ninetales, and beat a once boosted Altaria.
Team Work: My general sweeper, and revenge killer if needed. Kills Fire types for Steelix and Venusaur, and takes their fire hits. My only answer to Altaria.
Venusaur (M) @ Choice Specs
Ability: Overgrow
EVs: 252 SpA/236 HP/22 Spe
Modest nature (+SpA, -Att)
-Leaf Storm
-Hidden Power Psychic
-Sludge Bomb
-Sleep Powder
Description: Venusaur is another staple on any of my UU teams. That Specs Leaf Storm is just so awesome, it OHKOs half the metagame. Sludge Bomb to hit bulky grass types, and I use it whenever I feel like I can get over 1 kill. Hidden Power Psychic is for Hitmontop, Weezing, and Toxicroak, which this team can't really handle.
EVs: Max Special Attack for the hurting on most opponents, and to 2HKO Grumpig, and 3HKO Hypno. HP Evs seeing as I want this to be able to take most Close Combats, and come back for the OHKO with HP Psychic.
Team Work: Takes out Bulky Waters, and is 1 out of 2 of my team's offensive core. Supports team with taking out most counters, and can also Sleep opponents.
Hitmonlee (M) @ Life Orb
Ability: Limber
EVs: 252 Att/6 SpD/252 Spe
Adamant nature (+Atk, -SpA)
-Close Combat
-Earthquake
-Stone Edge
-Sucker Punch
Description: Hitmonlee gives the team it's offensive core. It covers a wide amount of Pokemon with Venusaur, and hurts about everything. Close Combat for STAB and the possible OHKO on Steelix with Stealth Rock up. Earthquake and Stone Edge provide good coverage, and Sucker Punch is useful with it's priority.
EVs: Max Attack and Speed for general sweeping. Nothing else really notable, except it runs rampant when the Thunder Waves are up.
Team Work: Hitmonlee forms my offensive core with Venusaur, and breaks down enemies. This guy is needed on the team, but I feel like something could replace him.
Damage Calculations:
Ninetales:
2x Flamethrower v. Max HP / SpD Thick Fat Grumpig 31.56%-37.21%
2x Flash Fire Flamethrower v. Max HP / SpD Thick Fat Grumpig 47.18%-55.48% 2HKO
2x Flash Fire Flamethrower v. Max HP / SpD Hypno 44.05%-51.77%
Venusaur:
Specs Leaf Storm v. Max HP / SpD Hypno 65.27% - 76.85% 2HKO
Specs Leaf Storm v. Max HP / SpD Clefable 75.53% - 88.82% 2HKO
Specs Leaf Storm v. Max HP / SpD Grumpig 70.10% - 82.39% 2HKO
Hitmonlee:
Close Combat v. Max HP / Min Def 82.49% - 96.89% Stealth Rock OHKO
This team is fairly balanced, as most UU teams are, and is fairly easy to use. The team members all have key resistances as well, which makes prediction and switching a breeze, or so I thought. This team has about a 75% win ratio, and never really wins by hax. The high win ratio might make you think I'm not telling the truth, but it was a crowded time, so I could have been facing lesser players. Whatever.
The strategy is this: Cripple opponents with Banette and Clefable, and come in on hits with my teams resistances. The 3 sweepers often don't come out until late game, so they can sweep easier. Steelix is a bit of an oddball, but is a must in all UU teams. Now, the team itself.

Banette (M) @ Choice Scarf
Ability: Insomnia
EVs: 204 HP/90 Atk/216 Spe
Jolly nature (+Spe, -SpA)
-Trick
-Wil-o-wisp
-Thunder Wave
-Shadow Claw
Description: skiddle's Banette lead. Tricks a Choice Scarf onto wall leads like Steelix or Claydol, and then proceeds to double status. Electrode and Miltank leads are it's only problem. Wil-o-wisps first, and proceeds to Thunder Wave sweepers. Shadow Claw deals with Claydol, Drifblim, Rotom, and Mr. Mime leads.
EVs: These EVs allow for Banette to get to 363 speed with the Scarf, 263 without it. The HP EVs allow for minimum Stealth Rock damage, and Banette can live through most hits. Attack EVs for Shadow Claw to hopefully do something.
Team Work: Lot of it. Banette gives me a great start by giving Venusaur and Hitmonlee paralyzed opponents, and Wil-o-wisp allows for safer switch-ins. Tricking a Scarf onto Clefable also just destroys it. Banette can also come back in on Close Combats for more crippling.

Clefable (M) @ Leftovers
Ability: Magic Guard
EVs: 252 HP/252 SpD/6 Def
Calm nature (+SpD, -Att)
-Thunder Wave
-Encore
-Seismic Toss
-Softboiled
Description: This Clefable fits best with my team's strategy by just messing up my opponent's. Thunder Wave to support my sweepers, and Encore for safe switches. Counters almost every special threat in UU. Seismic Toss to out-stall Miltank and friends. Most of the time, people anticipate Calm-Clefable, which is a big mistake.
EVs: Max Special Defense to take two Specs/LO Ice Beams from Glaceon, and two Leaf Storms from a Specs-Saur. No Defense EVs needed, because this Clefable isn't meant for mixed walling, unlike the analysis says.
Team Work: Pairs well with Banette to be able to screw over my opponent's team. If I encore a Ninetales' Flamethrower, I switch to my Ninetales to get a free Nasty Plot. Encore also works with my team's "resistance" strategy.

Steelix (M) @ Leftovers
Ability: Sturdy
EVs: 252 HP/120 Att/136 SpD
Brave nature (+Atk, -Spe)
-Stealth Rock
-Earthquake
-Gyro Ball
-Roar
Description: The most used Pokemon in the UU metagame, happens to be on my team. Steelix is bog-standard, and so is the set. Sets up Stealth Rock, and Roars away things. Earthquake and Gyro Ball for STAB and coverage. Takes hits like a man.
EVs: Max HP, and put the rest in Special Defense to survive weak attacks. Attack EVs to actually hurt something. 0 Speed IV and Brave for Gyro Ball's power.
Team Work: Takes hits for the entire team, and counters a hell lotta Pokemon. Setting up Stealth rock helps Clefable and Banette with their Status shuffle.

Ninetales (M) @ Life Orb
Ability: Flash Fire
EVs: 252 SpA/6 HP/252 Spe
Timid nature (+Spe, -Att)
-Nasty Plot
-Flamethrower
-Energy Ball
-Hidden Power Rock
Description: Almost nothing can take a Flash Fire x2 LO Flamethrower, which this guy often gets. Come in on a Fire move, and Nasty Plot up, then sweep with good coverage. Hidden Power Rock counters Altaria and other Ninetales, and rounds out the coverage on this set.
EVs: Max Special Attack and Speed to outpace and OHKO most things. Timid over Modest to win the speed tie with other Ninetales, and beat a once boosted Altaria.
Team Work: My general sweeper, and revenge killer if needed. Kills Fire types for Steelix and Venusaur, and takes their fire hits. My only answer to Altaria.

Venusaur (M) @ Choice Specs
Ability: Overgrow
EVs: 252 SpA/236 HP/22 Spe
Modest nature (+SpA, -Att)
-Leaf Storm
-Hidden Power Psychic
-Sludge Bomb
-Sleep Powder
Description: Venusaur is another staple on any of my UU teams. That Specs Leaf Storm is just so awesome, it OHKOs half the metagame. Sludge Bomb to hit bulky grass types, and I use it whenever I feel like I can get over 1 kill. Hidden Power Psychic is for Hitmontop, Weezing, and Toxicroak, which this team can't really handle.
EVs: Max Special Attack for the hurting on most opponents, and to 2HKO Grumpig, and 3HKO Hypno. HP Evs seeing as I want this to be able to take most Close Combats, and come back for the OHKO with HP Psychic.
Team Work: Takes out Bulky Waters, and is 1 out of 2 of my team's offensive core. Supports team with taking out most counters, and can also Sleep opponents.

Hitmonlee (M) @ Life Orb
Ability: Limber
EVs: 252 Att/6 SpD/252 Spe
Adamant nature (+Atk, -SpA)
-Close Combat
-Earthquake
-Stone Edge
-Sucker Punch
Description: Hitmonlee gives the team it's offensive core. It covers a wide amount of Pokemon with Venusaur, and hurts about everything. Close Combat for STAB and the possible OHKO on Steelix with Stealth Rock up. Earthquake and Stone Edge provide good coverage, and Sucker Punch is useful with it's priority.
EVs: Max Attack and Speed for general sweeping. Nothing else really notable, except it runs rampant when the Thunder Waves are up.
Team Work: Hitmonlee forms my offensive core with Venusaur, and breaks down enemies. This guy is needed on the team, but I feel like something could replace him.
Damage Calculations:
Ninetales:
2x Flamethrower v. Max HP / SpD Thick Fat Grumpig 31.56%-37.21%
2x Flash Fire Flamethrower v. Max HP / SpD Thick Fat Grumpig 47.18%-55.48% 2HKO
2x Flash Fire Flamethrower v. Max HP / SpD Hypno 44.05%-51.77%
Venusaur:
Specs Leaf Storm v. Max HP / SpD Hypno 65.27% - 76.85% 2HKO
Specs Leaf Storm v. Max HP / SpD Clefable 75.53% - 88.82% 2HKO
Specs Leaf Storm v. Max HP / SpD Grumpig 70.10% - 82.39% 2HKO
Hitmonlee:
Close Combat v. Max HP / Min Def 82.49% - 96.89% Stealth Rock OHKO