I like this set:
*Toxic-self explanatory
*Metal Burst-great for shooting damage back at the opposition
*Taunt-great tanking move and works great with Metal Burst
*Earthquake/Stone Edge/Iron Head-just an attack when/if you need it. I prefer EQ over the STAB moves personally, because Stone Edge has low PP and unreliable accuracy and Bastiodon is meant to last a long time (just keep it away from Fighting, Ground, and Water attacks) and Iron Head doesn't have good coverage.
Support-
*Stealth Rock
*Toxic
*Protect
*Iron Head
Multi-battle partner (Gen 5)-
*Wide Guard
*Toxic
*Protect/Taunt
*Earthquake
Annoyer-I recently thought of this set and plan to try it out myself. Theoretically it could work.
*Toxic
*Swagger
*Protect/Metal Burst/Iron Defense
*Iron Head