Thanks Virizion, so now I think I'll use a Heatproof Bronzong. Like I said, it was a gimmick, so some things may be "out of place from the standards".
I have ALWAYS wanted to use a Dwebble competitively, and of course, I mean in GBU, so I made this:
Dwebble @ Dark Gem
Adamant
252 Atk/252 Spd/6 HP
Shell Smash
Night Slash
X-Scissor
Rock Blast
Recently I've discovered, yes, a DAMAGE CALCULATOR!!! And I've used it to my benefits. According to it, and hopefully I'm not wrong with this, Rock Blast without any boosts, each rock, will decimate over a half of Accelgor's HP (A 6 HP set), and is used first against said Accelgor, since even after Shell Smash, Dwebble cannot outrun Accelgor, and it's the only one he cannot outrun after a Shell Smash, other than some other Scarfed Pokemon. After a Shell Smash, Dark Gem Night Slash will OHKO 252 HP/252 Atk Golurk, since he resists both Rock Blast and X-Scissor. Rock Blast is to break Substitutes, and X-Scissor is for STAB and coverage.
EDIT: I feel soooo much better knowing damage calculators exist.