A Dunsparce that is EV'd in HP and Attack can also be very annoying! Roost, Headbutt, Rock Slide, and Glare / Earthquake is all you need, my friend.
Because of Serene Grace, Dunsparce's STAB Headbutt or Rock Slide can be extremely useful. Use Glare for Para-fusion, or Earthquake to hit back Steel-types.