An idea occurred to me last week, but still needs the rough edges trimmed.
Marowak @ Thick Club
Ability: Lightningrod
Nature: Brave (+Atk, -Spd)
SUBSTITUTE
BELLY DRUM
EARTHQUAKE
ROCK SLIDE
EVs: 252 Atk, 252 HP, 6 Def
Togekiss @ Lum Berry
Ability: Serene Grace
Nature: Relaxed (+Def, -Spd)
FOLLOW ME
EXTREMESPEED
PSYCH UP
BATON PASS
EVs: 252 HP, 200 Def, 56 SDef
Kecleon @ Leftovers
Ability: Colour Change
Nature: Relaxed (+Def, -Spd)
LAST RESORT
TRICK ROOM
FAKE OUT
SCREECH
EVs: 252 HP, 200 Def, 56 SDef
Scyther @ Choice Scarf/Band
Ability: Technician
Nature: Adamant (+Atk, -Spd)
AERIAL ACE
X-SCISSOR
BRICK BREAK
QUICK ATTACK
EVs: 252 Atk, 252 Spd, 6 HP
The idea behind this is fairly straightforward: Togekiss uses Follow Me, allowing Marowak a free Substitute. Togekiss's Lum Berry deals with status. If Togekiss survives the brutal assault it will Psych Up, then either Baton Pass out to my bulky Trick Roomer, Kecleon, or to Scyther, or attack with Extremespeed, whilst Marowak is maxing its attack. Marowak can now OHKO just about anything, and its two moves hit both Pokemon in a double battle. While Marowak unleashes hell, Kecleon creates the room and I'm set to go. Kecleon also supports with Screech, Fake Out, and can attack with Last Resort when the going gets rough. Scyther is there just because I like him, and is a back-up just in case something goes wrong (at least, if the Trick Room has worn off by then...).
Please feel free to make any comments, corrections, or criticisms. This team requires a fair amount of luck, as well as needing a LOT of setup, so please factor this into your comments. Oh, and by the way, Togekiss has a 0 speed IV, so it is outsped by Marowak, and therefore can copy Marowak's boosts the same turn it Belly Drums.