I feel that C-rank is a bit too low for golurk. Golurk is the premier counter to physical fighting types because of its resistence to stone edge and his ghost typing. Golurk only loses to virizion and scrafty (who I believe is A-rank, but I will explain that later). Also, golurk has a big niche in the tier because he has the ability to setup SR and spinblock at the same time. He has good coverage with his attacks, only being walled by gligar. He also has the ability to 2HKO physically defensive slowbro. His 89/80/80 defenses aren't shabby and allow hit to tank hits from the likes of cobalion. All in all, golurk deserves to be B-rank imo.