Here is a team made entirely of NU pokemon designed to be competitive in OU. The basic outline of the team is to scout and eliminate steel and rock types, then set up dual screens and memento to let Linoone Belly Drum and sweep. I've had success with this set, but I feel it can be greatly improved. Now, for the team (note that I use all female where I can; this is because almost everyone leaves gender as default [male] in shoddy, so using attract requires a female pokemon to succeed. As such, when apposing a team of the sort [very rare] it is helpful):
Hitmonnorris (Hitmonchan) (M) @ Choice Scarf
Ability: Iron Fist
EVs: 252 Atk/252 Spd/4 SDef
Adamant nature (+Atk, -SAtk)
- Close Combat
- Ice Punch
- Rapid Spin
- Fire Punch
This can suprisingly outspeed many things; unfortunately, many leads are faster. I'm thinking of moving it back and getting a different lead, as it is needed more often midgame to revenge kill. Also, it is one of the few NU pokemon that can actually use Rapid Spin with fair speed, further making it more important later on.
Your mom (Bibarel) (F) @ Leftovers
EVs: 252 HP/156 Def/100 SDef
Careful nature (+SDef, -SAtk)
- Super Fang
This bibarel has two purposes: to take down walls with Taunt and Super Fang, but more importantly to shut down boosting sweepers with Unaware and Yawn. The basic strategy is to Yawn as soon as possible on a booster; unfortunately, this doesn't too well on CroCune, etc but you can still take them out with Super Fang/Waterfall. Due to Unaware, the opposing pokemon's boosts and drops are ignored (take note that this will allow Superpower and Close Combat with no penalty). Of course, you can take advantage of people not knowing that. This also can help take care of bulky steels by Super Fanging them to bring them into KO range for Linoone.
Saana (Gardevoir) (F) @ Light Clay
EVs: 252 HP/136 Spd/120 SDef
Calm nature (+SDef, -Atk)
- Light Screen
The only purpose here is to set up Dual Screens and Memento and then switch to Linoone. Nothing interesting here, move along.
Nidoestrino (Nidoqueen) (F) @ Leftovers
Ability: Poison Point
EVs: 252 HP/4 Atk/252 Def
Impish nature (+Def, -SAtk)
- Toxic Spikes
- Stealth Rock
Basically, this sets up Toxic Spikes and SR. However, I'm in need of something else (hopefully that would make a good lead) as it can barely even set up one before dying (and Linoone almost always OHKOs anyways).
Porygon9001 (Porygon2) @ Leftovers
EVs: 252 HP/216 Def/40 SAtk
Bold nature (+Def, -Atk)
- Ice Beam
- Thunder Wave
Trace really makes Porygon2 not completely overshadowed by PorygonZ. This set allows it to take out many counters to Linoone, such as intimidate users and Heatran. It also makes short work of Jolteon and Vaporeon.
Lino one (Linoone) (F) @ Salac Berry
EVs: 116 HP/252 Atk/136 Spd/4 SDef
Adamant nature (+Atk, -SAtk)
- Belly Drum
- Shadow Claw
This here is the keystone of the set, the useless rodent people laugh at until it sweeps the rest of their team (by the time it's set up, I usually have no or one other pokemon left). Belly Drum activates the Salac berry because of Gluttony, while you have Extremespeed to outspeed everything but faster opposing priority (not common at all). Return is to get a harder hit on walls you'll outspeed (I've considered replacing it with Seed Bomb to take care of rock types). To not get KO'd while setting up takes dual screens and Memento from Gardevoir; but Memento by itself can suffice in a pinch.
Well, there you go. Please don't be easy on the criticism, as I want to get as much help as possible.