Minun
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Minun provides the nigh mandatory Nasty Plot support for Corsola.

Banette
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Banette is completely immune to Fighting, potentially threatening out the target.

Flareon
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Flareon punishes Grass-type switch-ins with Flare Blitz.

Carnivine
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Carnivine takes Grass and Water-type attacks for Corsola, and can cause dents in the opposing team with Power Whip or Crunch.

Golurk
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Golurk is immune to Fighting and can threaten out plenty of threats with its high coverage.

Vikavolt
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Vikavolt can switch in on mostly anything that threatens Corsola and KO them or force them out.

Pinsir
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Pinsir resists Ground and Grass, and can retaliate with Close Combat.

Mesprit
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Mesprit is immune to Ground, which allows it to help Corsola significantly. Additionally, it can set Stealth Rock, which is highly beneficial for Corsola.