Keep in mind, this is an RU set.

Claydol
Entry hazard.
Item: Leftovers
Ability: Levitate
Moveset:
Stealth Rock
Rapid Spin
Toxic
Earthquake
Nature: Careful (+SpD/-SpA)
252 HP/4 Attack/252 Defense

Drapion
Physical sweeper.
Item: Scope Lens
Ability: Sniper
Moveset:
Night Slash
Cross Poison
Earthquake
Protect
Nature: Jolly (+Spe/-SpA)
4 HP/252 Attack/252 Speed

Clawitzer
Special Sweeper.
Item: Expert Belt
Ability: Mega Launcher
Moveset:
Water Pulse
Ice Beam
Dark Pulse
Aura Sphere
Nature: Modest (+SpA/-Atk)
252 HP/252 SpA/4 Speed

Tangrowth
Physical wall.
Item: Leftovers
Ability: Regenerator
Moveset:
Sleep Powder
Leech Seed
Power Whip
Hidden Power Ice
Nature: Relaxed (+Def/-Spe)
248 HP/252 Defense/8 Speed

Meloetta
Special wall.
Item: Leftovers
Ability: Serene Grace
Moveset:
Perish Song
Psyshock
Thunderwave
Dazzling Gleam
Nature: Calm (+SpD/-Atk)
252 HP/4 Defense/Spe. Defense

Spiritomb
Staller.
Item: Leftovers
Ability: Pressure
Moveset:
Toxic
Confuse Ray
Pain Split
Destiny Bond
Nature: Calm (+SpD/-Atk)
252 HP/252 Defense/4 Speed