Balanced Teams should always have good hazard control and make sure that the hazards don't stack up too much. In the current metagame there are many good Defoggers or spinners but having a spinner is better because it won't give the HO Deosharp teams the edge they want. When you talk about spinning one pokemon is surely to come into your mind, its Excadrill.
Excadrill (M) @ Choice Scarf/Life Orb/Air Balloon
Ability: Mold Breaker/Sand Rush
EVs: 252 Spd / 252 Atk / 4 HP
Adamant/Jolly Nature
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Earthquake
- Rock Slide
- Iron Head/Swords Dance/Stealth Rocks
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Rapid Spin
Excadrill is not only a good spinner but can also serve as a surprise revenge killer(if it has scarf) or late game sweeper(in the sand with sand rush), that is why having him in your team will always put offensive pressure and spin support. Having MB and one of best stab moves i.e. EQ, this thing can be your match winner, be it for a late game sweep or to get rid of rocks for team-mates to move around freely. ScarfDrill is always a good partner of any team, specially those weak to Rocks as it has a quad resistance, and can also spin off the rocks. Scarf along with a neutral nature is good enough for it to outspeed most of the unboosted metagame, unless you are running scarf you should always go for Jolly nature as it lets you outspeed the neutral 100 base speed mons. Sand Rush is also very potent with sand support but looses its MB and becomes vulnerable to Rotom-W, one of the most common pokemon in the current meta. He is able to get his job done most of the time and won't let you down.
I somewhat pondered Scarf Excadrill + Gravity Landorus can make a good offensive core. I briefly thought about it when one of the first posts mentioned a team using a Gravity Landorus. Some may consider Mold Breaker and Gravity to be redundant, and would prefer to use Scarfchomp, who has high speed, access to Stone Edge (and Fire Blast), and better statistical bulk (but Steel provides a valuable Flying resistance against priority Flying attacks), but Mold Breaker makes Excadrill less reliant on Gravity and it is not tactically limited by the presence of Pokemon with Levitate. In addition, Excadrill's effectiveness as a revenge killer/sweeper is not hampered by Stealth Rock, further increasing this Pokemon's utility. If there is no Gravity, Excadrill can check could threaten to KO 4x Rock weak Pokemon with no prior damage, but it cannot clean-up against weakened team. With Gravity in effect, Excadrill can be an effective cleaner that spams Earthquake in addition to merely revenging.
I thought about using LO Keldeo (can hit both sides and not worry about the inaccuracy of Hydro Pump) and LO Mamoswine (with its excellent movepool), but Keldeo and especially Mamoswine are too slow to exploit Gravity (and Keldeo's sweep can be thwarted by many HO Pokemon).
The tandem of Landorus and Excadrill is kind of like an Alekine's gun since you have two powerful Ground attacks that are difficult to block due to Mold Breaker and Gravity, similar to dual Flying teams. I thought Mold Breaker and Gravity would mitigate the impediment of being Choice-locked, and would provide a rather powerful STAB attack. Furthermore, since Excadrill is already weak to Ground attacks, Excadrill isn't adversely affected by Gravity (although the opportunity cost of the Scarf is losing the valuable Air Balloon and this render Excadrill vulnerable to Scarf Lando-T and Garchomp). Furthermore, the Scarf provides a means to avoid being KOed by ubiquitous HO offensive threats, such as Talonflame (could only use Brave Bird/Acrobatics) and Thundurus, although the core should be wary of Azumarill and Deoxys-S.
Gravity Earthquake can kill Skarmory if you sac Landorus to set up Gravity:
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 232+ Def Skarmory: 212-252 (63.4 - 75.4%) -- guaranteed 2HKO after Leftovers recovery
although Chansey wouldn't be 2KOed and would stall out Earthquake and precious Gravity turns with Softboiled:
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 252+ Def Eviolite Chansey: 246-289 (34.9 - 41%) -- guaranteed 3HKO
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 232+ Def Skarmory: 212-252 (63.4 - 75.4%) -- guaranteed 2HKO after Leftovers recovery
Since the core cannot easily dispatch Chansey, it is tempting that Landorus run Superpower in addition to Psychic and Earth Power as opposed to Focus Blast.
252 SpA Life Orb Sheer Force Landorus Focus Blast vs. 252 HP / 4 SpD Eviolite Chansey: 260-307 (36.9 - 43.6%) -- guaranteed 3HKO
0 Atk Life Orb Landorus Superpower vs. 252 HP / 252+ Def Eviolite Chansey: 359-424 (50.9 - 60.2%) -- guaranteed 2HKO
-1 0 Atk Life Orb Landorus Superpower vs. 252 HP / 252+ Def Eviolite Chansey: 239-283 (33.9 - 40.1%) -- guaranteed 3HKO
Superpower does not require a turn of set-up nor suffers from accuracy issues, but both moves can be stalled out with Softboiled/Wish + Protect if Chansey isn't in KO range. A weakened Chansey and Air Balloon Heatran can be defeated on the switch with Superpower, although the point is likely moot with Heatran since the Balloon can be popped Psychic on the switch.
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Adamant is necessary to cleanly KO Mega Mawile but it cannot do this if it has set-up:
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 0 Def Mega Mawile: 306-360 (100.6 - 118.4%) -- guaranteed OHKO
252+ Atk Huge Power Mega Mawile Sucker Punch vs. 4 HP / 0 Def Excadrill: 249-294 (68.7 - 81.2%) -- guaranteed 2HKO
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A Life Orb/Choice Band/Mega Scizor can also work with the core since it acts as an offensive anti-cleric with Superpower and Technician Bullet Punch. Superpower is necessary because it also provides an additional means to pressure Chansey and LO increases the chance Superpower will be in KO range. Furthermore, it allows Scizor to 2HKO Skarmory when Gravity is in effect. Gravity also works against Mandibuzz, making it deadly with U-Turn. Needless to say, Superpower and Bullet Punch with U-Turn will help keep the opponent guessing with the threat of momentum or a KO. Moreover, Technician Bullet Punch is a very strong priority move (aside from Sucker Punch, priority Brave Bird, and Aerilate Quick Attack) and is not affected by recoil, require hazard removal, or can be played around.
Roost seems to be the best fourth move, since it enables it to act as a pivot longer.
Perhaps some speed investment to outspeed uninvested Skarmory, Heatran, and Mandibuzz would be worth it.
Rotom-W or Thundurus-I would be a good fourth partner, since they can deal with. Rotom-W forms a Volt-turn pivot core with Scizor; Thundurus can cripple something for Landorus, and LO HP Ice cleanly deals with Gliscor which wouldn't otherwise be affected by any of Scizor or Excadrill attacks. They both can deal with Skarmory.