Dark does ×1 to Normal

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

69 Dark and 131 Normal species among the 1025 this site covers.

Attacker, Dragon and Dark Roaring Moon sprite

damage×1Generations VI to IX

Defender, Normal Blissey sprite

Blissey #0242

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

Strongest Dark attackers

Roaring Moon leads Dark at Atk 139

Sturdiest Normal defenders

Dual types that change the answer