Well, here's what I came up with...
Grovyle (M) @ Leftovers
Trait: Overgrow
EVs: 4 HP / 252 Spd / 252 SAtk
Modest Nature (+SAtk, -Atk)
- Leaf Blade
- Hidden Power [Ice]
- Substitute
- Leech Seed
McGrovyle :P
Corphish (M) @ Quick Claw
Trait: Hyper Cutter
EVs: 96 HP / 252 Atk / 60 Def / 100 SDef
Adamant Nature (+Atk, -SAtk)
- Brick Break
- Sludge Bomb
- Aerial Ace
- Hidden Power [Rock]
This is your only hope with this thing, it's to slow and weak for a Choice Band...
Torkoal (M) @ Leftovers
Trait: White Smoke
EVs: 132 HP / 16 Atk / 100 Def / 124 SAtk / 136 SDef
Relaxed Nature (+Def, -Spd)
- Amnesia
- Flamethrower
- Hidden Power [Dragon]
- Explosion
Amnesia to boost his lower defense (Special), Flamethrower and HP Dragon have no resistance in the game, and Explosion is for the "boom" factor, consider Rest over Explosion though.
Snorunt (M) @ Leftovers
Trait: Inner Focus
EVs: 100 HP / 100 Def / 252 SAtk / 56 SDef
Modest Nature (+SAtk, -Atk)
- Ice Beam
- Light Screen
- Hidden Power [Electric]
- Double Team
Light Screen to help the team out after he dies, Ice Beam and HP Electric since it covers everything but Magneton, Lanturn, and Shedinja. Double Team because otherwise he won't work.
Swellow (M) @ Choice Band
Trait: Guts
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature (+Atk, -SAtk)
- Facade
- Aerial Ace
- Quick Attack
- Hidden Power [Rock]
Choice Band because he kicks arse if you can switch him in on a stat effect, and use Facade :P. Aerial Ace, because it gets STAB, Quick Attack since otherwise Subrevvers/flailers will wreck you, and HP Rock to cover flyers.