Sorry to say, I'm wincing as I read this. Your team needs some help, but don't worry, 'cause I'm gonna provide it! :D
You should lead off with Tyranitar, as its Sand will benefit some teammates.
Tyranitar @ Focus Sash
EVs: 252 Atk/252 Spd/4 HP
Ability: Sand Stream
- Dragon Dance
- Stone Edge
This provides great coverage. Most leads will set up, so Tyranitar won't get KOd. He can set up DD and sweep freely :) For anything that resists his Outage, he can use the formidable EdgeQuake combo.
Spiritomb: Spiritomb's a cool wall, but Umbreon's better. (BTW, Sucker Punck made me laugh...)
Umbreon @ Chople Berry
EVs: 252 HP / 128 Sp. Def / 128 Spd
Moves: Baton Pass, Mean Look, Wish, Taunt
Umbreon can BP really well. WHenever you need to trap, just Mean Look and BP onto a sweeper. Also, if one of your Pokemon needs some support, just Wish for some and it will come ;D Although make sure you set up Taunt first so as not to get Taunted yourself.
Credit to Smogon for set.
Next up is Hydriegon, who should be a sweeper.
Hydriegon @ expert belt
EVs: 252 Sp. Atk/252 Spd/ 4 HP
- Dark Pulse
- Flamethrower/Fire Blast
- Focus Blast
- Draco Meteor/Dragon Pulse
Ah, the odd triple-headed Hydreigon. What an awesome sweeper... Nature and EVs are pretty standard, DP is STAB, and Focus Blast is coverage. Flamethrower/FB is a matter of preference: reliability or power. Same goes for the dragon moves...
Next up, Sableye. You already have a wall so I would recommend a sweeper, such as Krookodile.
Krookodile @ Choice Scarf
Moves: Earthquake, Crunch, Aerial Ace, Shadow Claw
It's a power-sweeping, coverage set. Not much more to say...
Houndoom will serve as your special sweeper. Just replace Early Bird w/ Flash Fire, and Solarbeam with HP Grass. Another coverage sweeper, but special...
Lastly, the Mandibuzz!
Mandibuzz (F) @ Leftovers
EVs: 252 HP / 252 Def / 4 SDef
Impish Nature (+Def, -SAtk)