Carnivine
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Carnivine is completely immune to Ground thanks to Levitate, making it an excellent switch-in to Ground-type Pokémon. Additionally, STAB Power Whip can punch large holes in opposing Ground-types, if not outright OHKOing them.

Torterra
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Torterra easily shrugs off Ground-type attacks, threatening the opponent out with STAB Seed Bomb.

Vikavolt
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Vikavolt can switch in on Earthquake or Earth Power easily thanks to Levitate, threatening the opponent out with Energy Ball.

Pinsir
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Pinsir shrugs off Ground-type attacks fairly well and can hurt the target with Close Combat.

Mesprit
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Mesprit is immune to Ground-type attacks and packs a powerful STAB Psychic.