This is my first 2 vs. 2 team and IMHO it probably Stinks. -_-
So go easy on me.

Duo number 1:

Item: Leftovers
Ability: Keen Eye
Nature: Adamant
Moves:
Toxic
Spikes
Protect
Drill Peck
Role: Protecter 1/Spiker


Item: Shell Bell
Ability: Torent
Nature: Quiet
Moves:
Surf
Earthquake
Curse
Protect
Role: Protecter 2/Curser

a Protect duo is very anoying. Leftovers to regain health, Keen Eye so i can have Drill Peck insted of Aerial Ace, Protect so it can Stall agenst Magnaton long enogh for Swampert to use Earthquake, Drill Peck to cach unexpceting Grass types before they hit Swampy.
Curse, Surf, and Earthquake + Shell Bell for stat bost, STAB, and health recovery, Protect for general anoyance.

Duo number 2:

Item: Bright Powder
Ability: Levitate
Nature: Hardy etc?
Moves:
Sandstorm
Rapid Spin
Cosmic Power
Toxic
Role: Tank/Rapid Spiner



Item: Leftovers
Ability: Suction Cups
Nature: Brave/Quiet (depending on which attack stat is higher)
Moves:
Giga Drain
Rock Slide
Barrier
Recover
Role: Tank

Horay! I bring Claydol back!
Claydol is easy to figure out, Rapid Spin to get rid of enemy spikes, and can act as a tank. Duh!
Cradlily is also a tank and attack super efectively agenst other Rapid Spiners.

Duo number 3:

Item: ???
Ability: Levitate
Nature: Joly
Moves:
Haze
Destiny Bond
Sluge Bomb
Shadow Ball
Role: Hazer


Item: ???
Ability: Clear Body
Nature: Quiet
Moves:
Agility
Meteor Mash
Psychic
Earthquake
Role: Sweper

Yah i know, Agility and Haze contridict eachother -_-
anyway if you can think of some hold items i'm open to suggestions.
I'm to tired to explan this duo so figure it otu for your selves -_-

constructive Suggestions, tips, and words of wisdom will be gladly welcomed.