Fairy does ×1 to Ground

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

64 Fairy and 75 Ground species among the 1025 this site covers.

Attacker, Psychic and Fairy Hatterene sprite

damage×1Generations VI to IX

Defender, Rock and Ground Onix sprite

Onix #0095

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

Strongest Fairy attackers

Hatterene leads Fairy at Sp. Atk 136

Sturdiest Ground defenders

Dual types that change the answer