Ground does ×2 to Steel

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

75 Ground and 65 Steel species among the 1025 this site covers.

Attacker, Ground Groudon sprite

Groudon #0383

damage×2Generations VI to IX

Defender, Steel and Ground Steelix sprite

Steelix #0208

Steel did not exist in Generation I, so Ground against Steel has no value there.

Strongest Ground attackers

Groudon leads Ground at Atk 150

Sturdiest Steel defenders

Dual types that change the answer