Why does Trapinch have Crunch? Is it just filler?
Priority attacks can probably OHKO Trapinch, as well as anything that survives Earthquake or Rock Slide.
Switching Trapinch for Rhyperior kind of guarantees that you OHKO everything, with Shedinja cleaning up Grass-types with X-Scissor. Lack of Arena Trap sucks, but with Rhyperior's giant Defense and HP, he should be able to survive a few hits. Switching Dusknoir for Sash Smeargle with Trick Room, Magma Storm, Dark Void, and filler would be an alternative you could try.