Oh. I can see a select few Pokemon giving some real trouble. Mainly Pokemon that can take a hit and retaliate, such as Slowbro, Hippowdon, Skarmory, Ferrothorn, Forretress, etc. I'd suggest a bulky special attacker that can counter physical tanks and such. Garchomp and Excadrill pretty much preform the same job, so I'd say replace one of them.