Dark does ×1 to Rock

Generations VI to IX, single types. The other way round, Rock against Dark, is ×1.

69 Dark and 74 Rock species among the 1025 this site covers.

Attacker, Dragon and Dark Roaring Moon sprite

damage×1Generations VI to IX

Defender, Bug and Rock Shuckle sprite

Shuckle #0213

Dark did not exist in Generation I, so Dark against Rock has no value there.

Strongest Dark attackers

Roaring Moon leads Dark at Atk 139

Sturdiest Rock defenders

Dual types that change the answer