Gigear...
324/339/310 (252 HP, 252 ATK, 6 SDF, neutral nature for defenses) is pretty nice. For comparison, Bronzong has 338/268/269 with the same stat boosts. Then it uses Gear Change a few times (while taking hits like a beast) and sweeps.
Ground, fighting, and fire move are fairly major problems, as Gigear has a bit of trouble hitting those types; all of them resist Gear Saucer iirc, so you'll have to hit them with Return. However, I firmly believe this set could work in lower enviroments. I ought to write an analysis for it.