Hi there! I'm not a really awesome player in NU, but I have this core:
Misdreavus (F) @ Eviolite
Trait: Levitate
EVs: 252 HP / 232 Def / 24 Spd
Bold Nature (+Def, -Atk)
- Heal Bell
- Pain Split
- Shadow Ball
- Will-O-Wisp
Skuntank (M) @ Black Sludge
Trait: Aftermath
EVs: 20 HP / 252 Atk / 236 Spd
Adamant Nature (+Atk, -SAtk)
- Pursuit
- Taunt
- Sucker Punch
- Crunch
So yea, this cores has a great synergy in it with. Misdreavus takes the Ground type weakness of Skuntank easily with the given Evs spread while on the otherhand, Skuntank takes on the Ghost and Dark type weaknesses of Misdreavus. And since Misdreavus is an amazing spin blocker, this core will become much effective when given hazards support so spikes users like Garbodor, Dwebble or Glalie can be added to this core.

Misdreavus (F) @ Eviolite
Trait: Levitate
EVs: 252 HP / 232 Def / 24 Spd
Bold Nature (+Def, -Atk)
- Heal Bell
- Pain Split
- Shadow Ball
- Will-O-Wisp

Skuntank (M) @ Black Sludge
Trait: Aftermath
EVs: 20 HP / 252 Atk / 236 Spd
Adamant Nature (+Atk, -SAtk)
- Pursuit
- Taunt
- Sucker Punch
- Crunch
So yea, this cores has a great synergy in it with. Misdreavus takes the Ground type weakness of Skuntank easily with the given Evs spread while on the otherhand, Skuntank takes on the Ghost and Dark type weaknesses of Misdreavus. And since Misdreavus is an amazing spin blocker, this core will become much effective when given hazards support so spikes users like Garbodor, Dwebble or Glalie can be added to this core.