[B] Looking for a third

So far I've got:

Flygon @ (Choice Band or Scarf)

Adamant 4 HP/252 Attack/252 Speed

Crunch

Earthquake

Rock Slide

Dragon Claw

Cloyster @ (White Herb or Life Orb)

Jolly 4 HP/252 Attack/252 Speed

Icicle Spear

Shell Smash

Rock Blast

Razor Shell

...and I'm not sure what to do with a third. I'm looking for something that resists Dragon, Grass, and Fighting, preferably that uses special attack. I don't think anything CAN resist all three because steel is the only thing resistant to Dragon, but something that at least isn't weak to fighting would work. Flying/steel, bug/steel and psychic/steel fall into that category. Maybe mixed Metagross? Any other ideas?

Edit: Formatting. Also, I'm considering running some kind of disabler maybe? I haven't really worked with much before besides tanks and sweepers (impatient to a fault).