You could also use Foresight or Odor Sleuth, or have a Pokemon with Scrappy, and use a Fighting move. Future Sight or Mold Breaker. Or you could change its type with Soak or Forest's Curse, unless Wonder Guard blocks those.
I think an Electric DR with Wonder Guard would be harder to deal with. It would also only take damage from one type, but have less loopholes and you'd probably have to watch out for paralysis.