If this is for Single 6v6 then you definitely need a rapid spinner. The obvious one is Donphan, but sometimes it's nice to surprise your opponents and for that I would suggest Avalugg. With 184 in defense he has one of the highest in game, not to mention access to recover. The only downside is that Ice kind of sucks as a defensive typing, but you've got his weaknesses covered pretty wel, so he might work for you.
As far as your Special I would suggest Gengar or Volcarona. Either of them will cover type you don't already have.
Here are my set for these three:
Avalugg w/Leftovers or Sitrus Berry
Ability: Sturdy
Evs: 252 HP/4 Atk/252 Def
Nature: adamant
- Rapid Spin
- Recover
- Avalanche
- Earthquake
Gengar w/ Black Sludge or Life Orb
Ability: Levitate
Evs: 4 HP/252 SpA/252 Spe
Nature: Timid
- Substitue
- Pain Split
- Shadow Ball
- Focus Blast/Sludge Bomb/Sludge Wave (again depending on what format)
Volcarona w/ Leftovers or Lum Berry
Ability: Flame Body
Evs: 240 HP/252 Def/16 Spe
Nature: Timid
- Quiver Dance
- Fiery Dance/Heat Wave
- Bug Buzz
- Roost/Morning Sun
These have all work well for me. Let me know if you need any more clarification on these sets.
Avalugg is rather subpar, IMO, because of its common weaknesses. Excadrill is the better Rapid Spinner in all cases:
-Earthquake
-Iron Head/Rock Slide
-Rapid Spin
-Swords Dance/Stealth Rock
Nature: Adamant/Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Air Balloon/Leftovers
Ability: Mold Breaker
or
-Earthquake
-Iron Head
-Rock Slide
-Rapid Spin
Nature: Adamant/Jolly
EVs: 120 HP/136 Atk/252 SDef (Adamant) or 252 Atk/4 Def/252 Spe (Jolly)
Item: Assault Vest (Adamant)/Choice Scarf (Jolly)
Ability: Mold Breaker
Fire Blast is preferred over Heat Wave; Heat Wave only sees use in doubles and VGC formats.