I love double battles and figure this would be a good place to post a team I've been working on.
Hopefully no one's posted this before.
Bronzong @ Lum Berry
Levitate
Nature: +Special D -Speed
252 HP / 152 Atk / 8 Def / 96 SpD
0 Speed IVs
Hypnosis
Trick Room
Gyro Ball
Explosion
Wait for it...
Shuckle @ Life Orb
Gluttony (ability unimportant, I tried a stat berry but it wouldn't work with this set up)
Nature: +D - Speed
252 HP / 252 Def /4 SpD
0 Speed IVs
Power Trick
Bug Bite
Earthquake
Rock Slide
Spiritomb @ Leftovers
Nature: + SpA - Speed
0 Speed IVs
252 HP/ 252 Special Attack / 4Defense
Nasty Plot
Pain Split
HP Fight
Shadow Ball
Heatran @ Choice Specs
Nature: + SpA - Speed
0 Speed IVs
252 Special Attack, 204 D, 52 HP (Might be off, I just want him to survive a priority fighting attack from a CB user)
Heat Wave
HP Grass
Dragon Pulse/Earth Power
Explosion
Ok so the idea is to first turn use Trick Room and Power Trick. The two leads are so defensive that unless they have two good fire attacks Bronzong will live, and they'll usually want to status him because Shuckle isn't intimidating so Lum Berry is great. Shuckle will Power Trick as the last move since he's so slow allowing him to eat attacks while he has good defenses. RockSlide and Earthquake work well to do massive damage to both of their team, RockSlide's stab negates the multi-attack penalty. Bug Bite is nice because it can OHKO many that won't be taken out by EQ or RS. Bronzong then provides support using Hypnosis or GBall to finish off the sweep.
If Bronzong has to explode for some reason I'll switch in Spiritomb, if Bronzong is likely to eat a fire attack again I'll switch in Heatran and then use it against them for a massive Heat Wave.
I'm not too confident about Pain Split, but it can be fun in doubles with Trick Room to provide some recovery or lay the hurt with the double attack move, otherwise Spirit Omb just cleans up.
A Shuckle sweep is just awesome to behold.