Core: Escavalier / Kingdra

One drawback of the previous offensive core of Heracross / Medicham was that it lacked defensive synergy, although its offensive synergy is phenomenal. Escavalier and Kingdra, however, have typings that complement each other perfectly. With each opening up opportunities for the other to sweep, they function well as a powerful bulky offensive core.

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Kingdra @ Chesto Berry 

Trait: Swift Swim 

EVs: 180 HP / 160 Atk / 4 SDef / 164 Spd 

Adamant Nature (+Atk, -SAtk) 

- Dragon Dance 

- Waterfall 

- Outrage 

- Rest

Escavalier @ Choice Band 

Trait: Swarm 

EVs: 248 HP / 252 Atk / 8 SDef 

Adamant Nature (+Atk, -SAtk) 

- Megahorn 

- Iron Head 

- Return 

- Pursuit

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Kingdra is blessed with one of the best type combinations in the game, along with deceptively good bulk. ChestoRest is Kingdra's most dangerous set for sweeping, capable of setting up multiple boosts against weaker attackers. Opponents unaccustomed to dealing with this set will be in for a big surprise with Rest, which essentially gives Kingdra a second life by healing off all damage and status ailments. Water + Dragon provides outstanding type coverage, with the only notable resistant Pokémon being Empoleon. High HP and considerable Attack investment give Kingdra good bulk and power. 164 Speed EVs allow the set to outspeed Scarf Flygon after two Dragon Dance boosts. 

Escavalier backs up Kingdra with perfect synergy and an incredible base 135 Attack stat. Both its offensive and defensive stats are superior to those of Scizor, making it an excellent bulky hitter. Although Escavalier's type coverage is poor, its damage output allows it to heavily dent even resisted switch-ins. Escavlier's main job is to punch holes through opposing teams for Kingdra to eventually sweep through.

Kingdra's main counter in UU will be Empoleon. Fortunately, it lacks recovery and is vulnerable to hazards. Even better, Empoleon Steel typing means that opponents may often switch it into Escavalier's attacks. With max HP Empoleon taking 49.46% - 58.33% from Megahorn, it can be taken down pretty fast. 

This core also has perfect defensive synergy, with each member resisting the other's only weakness. Opponents trying to use Scarf Flygon to check Kingdra will be put in a tough spot, with Escavalier waiting to switch in on Outrage and OHKO back with Megahorn. UU has much fewer Dragon- and Steel-types than OU, meaning a core like this can put giant pressure on standard teams.

Core: Registeel / Slowbro

The classic RegiBro core returns in BW with a number of useful new features. Registeel remains much the same as before, but Slowbro received an outstanding new ability in Regenerator and two solid STAB moves: Scald and Psyshock. Other than that, the two form a core that can easily take on some of the most dangerous physical and special threats in UU.

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Registeel @ Leftovers 

Trait: Clear Body 

EVs: 252 HP / 4 Def / 252 SDef 

Careful Nature (+SDef, -SAtk) 

- Stealth Rock 

- Iron Head 

- Seismic Toss 

- Toxic

Slowbro @ Leftovers 

Trait: Regenerator 

EVs: 252 HP / 252 Def / 4 SDef 

Bold Nature (+Def, -Atk) 

- Calm Mind 

- Scald 

- Psyshock 

- Slack Off

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Registeel covers most special threats with its gigantic Special Defense stat. It also works as a reliable Stealth Rock user and status spreader, thanks to its bulk and natural utility. Iron Head provides Registeel with a solid STAB move to hit Ghosts (notably Mismagius) with, while Seismic Toss is a great all-around move on a special wall. Toxic is preferred over Thunder Wave for hitting Ground-types and bulkier opponents.

Slowbro patches up its partner's weaknesses by functioning as the best physical wall in the tier. With a Calm Mind set, it can also take over as a bulky setup sweeper. Scald works nicely as a solid STAB move with a 30% burn rate, capable of crippling physical sweepers. Psyshock hits common switch-ins on their physical side, almost guaranteeing a OHKO after Stealth Rock on max HP Roserade. It also lets Slowbro win one-on-one against many other Calm Mind users. Slack Off rounds out the set by giving Slowbro reliable recovery, although Regenerator's 33% heal rate keeps Slowbro healthy just by having it switch out. 

These two Pokémon have some of the best defensive synergy in the game, making them the UU equivalent of SkarmBliss. Pair this core up with hazards, bulky offensive members and a late-game cleaner, and you'll have a solid UU team on your hands.

Core: Heracross / Medicham

UU Time! This is an offensive core, functioning similarly to combinations like Excadrill / Landorus in OU. Heracross and Medicham can be played as parallel sweepers, each opening up holes in opposing teams so that the other can eventually sweep. Since these two are among the strongest Fighting types in the UU tier, very little can stand up to both of them together.

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Heracross @ Choice Band
Trait: Guts
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature (+Atk, -SAtk)
- Megahorn
- Close Combat
- Stone Edge
- Pursuit

Medicham @ Choice Scarf
Trait: Pure Power
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Hi Jump Kick
- Psycho Cut
- Ice Punch
- Trick

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Thanks to its high Attack stat, Heracross is capable of ripping holes in opposing counters so that Medicham can safely sweep later in the match. Megahorn is one of the few physical moves that can power through Slowbro, netting a clean 100% OHKO with this set. Pursuit can be used to trap and kill Ghost-types that could switch into the core's choiced Fighting attacks. Even better, Heracross' ability Guts ensures that it doesn't have to worry about being burned from Will-O-Wisp. Close Combat from this set also hits extremely hard, as Adamant Choice Band Heracross reaches the equivalent of 574 Attack. Stone Edge rounds out the set's coverage by hitting Flying-types on the switch.

In contrast with Heracross' wallbreaking potential, Medicham functions as more of a late-game sweeper. After Heracross has successfully broken through opposing counters, Medicham can freely spam its 130 BP STAB Hi Jump Kick off a Pure Power-boosted Attack stat of 438. This set offers good overall coverage, and an important emergency move in Trick. This can be used as a last resort to stop stat boosters, or it can be used on a prediction to cripple an opposing physical wall.

The prevalence of Chansey in UU allows these Fighting types to flourish. However, be aware that this is a purely offensive core, and needs to be backed up by teammates with solid resistances. Once this combo gets going, though, opponents will have a tough time responding to the dual threat.

Core: Skarmory / Gastrodon / Heatran

Weather basically defines the current BW OU metagame. Whether you like it or not, you'll need some way to deal with all the standard weather archetypes. But that doesn't mean you need to abuse weather yourself. Clear Skies has been shown to be a powerful team style, as long as you include appropriate checks and counters.

Skarmory / Gastrodon / Heatran is an excellent anti-weather core. Team Tabloo is the best example of what this combination is capable of. The three are capable of performing well against Sand, Rain and Sun teams, respectively. However, each individual member of the core is useful at combating at least two of the three weather types, meaning no member's role is too situational.

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Skarmory @ Leftovers

Trait: Sturdy

EVs: 252 HP / 216 Def / 40 Spd

Impish Nature (+Def, -SAtk)

- Brave Bird / Taunt

- Spikes

- Roost

- Whirlwind

Gastrodon @ Leftovers

Trait: Storm Drain

EVs: 252 HP / 4 SAtk / 252 SDef

Calm Nature (+SDef, -Atk)

- Earth Power

- Ice Beam / Scald

- Toxic

- Recover

Heatran @ Leftovers

Trait: Flash Fire

EVs: 252 HP / 248 SDef / 8 Spd

Calm Nature (+SDef, -Atk)

- Stealth Rock

- Lava Plume

- Toxic

- Roar

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Skarmory has always been one of the best physical walls in the game. With access to Spikes and Whirlwind, Skarmory is invaluable as an entry hazard provider. The current metagame is favorable for Skarmory, who can find frequent opportunities to set up or start phazing. Notable threats like Scrafty, Conkeldurr and Excadrill can all be handled by the steel phoenix. Brave Bird breaks Air Balloons and gives Skarmory a 120 BP STAB to work with, but Taunt can be used to shut down other entry hazard users, such as Ferrothorn. 

Despite its RU status, Gastrodon is one of the most valuable Pokémon around. Thanks to Storm Drain and its high Special Defense, it single-handedly walls many Rain sweepers. Burns from the likes of Rotom-W are simply shrugged off with Recover and Leftovers. +2 Thundurus deals only 63.38% - 74.65% with Focus Blast, meaning Gastrodon can function as a solid check to it. Earth Power is Gastrodon's most powerful move, hitting most opponents for good damage. Ice Beam gives Gastrodon a way to eliminate Dragons, but Scald can 
  be helpful for the STAB and potential burns it provides.

Heatran rounds out the core with Stealth Rock and some much-needed Fire coverage. In a metagame full of Steel-type entry hazard users, Heatran can be a very valuable addition to any team. With Lava Plume, Heatran makes life difficult for physical switch-ins like Tyranitar. A 30% burn rate is relatively high in Pokémon, meaning most physical attackers can be crippled by switching in. Toxic gives Heatran something to use against Volcarona, provided it manages to survive being phazed through Stealth Rock damage. Heatran's access to Roar gives the core an excellent second phazer that can take advantage of the switches it forces.

Although this core is solid on its own, it has issues with a few common threats. Late-game Excadrill can be particularly dangerous. If Skarmory is eliminated, weakened, or flinched enough by Rock Slide, the other two members will be swept after a Swords Dance. For this reason, an additional physical wall or powerful priority user is recommended.

Since this core is highly dependent on entry hazards, a spin blocker is also necessary. Gengar performs well in an offensive role, while Jellicent is pretty much the only choice for more defensive players. While both are capable Ghosts, Gengar has the advantage of flawless coverage backed by high Speed and Special Attack stats. When paired with hazard support, Gengar has the potential to sweep teams. Having a Ghost-type also provides a valuable Fighting immunity, which is invaluable against more powerful attackers like Choice Band Terrakion.

Overall, the Skarmory / Gastrodon / Heatran core is a solid combination to use against any type of team. It doesn't require much extra support and can cover a lot of threats on its own. Although weather controls the BW OU metagame, it doesn't have to control your team choices.