Ghost does ×1 to Fairy

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

65 Ghost and 64 Fairy species among the 1025 this site covers.

Attacker, Fire and Ghost Blacephalon sprite

damage×1Generations VI to IX

Defender, Fairy Florges sprite

Florges #0671

Fairy did not exist in Generation I and Generations II to V, so Ghost against Fairy has no value there.

Strongest Ghost attackers

Blacephalon leads Ghost at Sp. Atk 151

Sturdiest Fairy defenders

Dual types that change the answer