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For doubles I use:
Ability: Unburden.
Item: Sitrus Berry.
Return
Belly Drum
Play Rough
Protect
I rely on U-Turn, Fake-Out, Follow Me, Mat Block, Quick Guard and Mystic Field support to sweep entire teams. And if for whatever reason I have to sacrifice Slurpuff, I rely on Mega Absol with Psych Up to keep sweeping with the +6 attack boost. Most people will try their best to kill Slurpuff once it kills a couple of their pokemon, so you got a free turn with Absol to use Psych Up.
Greninja's Dark Pulse/Hydro Pump, Clefable's Fire Blast, and Mienshao's High Jump Kick are enough to deal with most steel types that try to stop you . Though you can 2KO the likes of Scizzor and Aegis if you bait their priority and use Quick Guard to render it useless. Then you will outspeed them in the next turn if they try to use a non-priority move, or OHKO anything they switch with.
I'm still experimenting with my team, so I keep replacing my sixth with either a third sweeper or another support pokemon.