What does the Rash nature do?

Rash raises Sp. Atk by 10% and lowers Sp. Def by 10%.

What stat does Rash increase?

Rash increases Sp. Atk by 10% and decreases Sp. Def by 10%. HP is unaffected.

A Rash Pokémon likes Dry flavors (tied to Sp. Atk) and dislikes Bitter flavors (tied to Sp. Def).

Yes. Use a Rash Mint to apply the Rash stat effect to any Pokémon without changing its displayed nature.

Nature

Raises Sp. Atk, lowers Sp. Def.

Raises Sp. Atk +10%

Lowers Sp. Def −10%

LikesDry

DislikesBitter

Special attackers on offense-first teams.

Modest −Attack Mild −Defense Quiet −Speed

What does the Rash nature do?: Rash raises Sp. Atk by 10% and lowers Sp. Def by 10%.
What stat does Rash increase?: Rash increases Sp. Atk by 10% and decreases Sp. Def by 10%. HP is unaffected.
What flavor does a Rash Pokémon like?: A Rash Pokémon likes Dry flavors (tied to Sp. Atk) and dislikes Bitter flavors (tied to Sp. Def).
Can I change a Pokémon to Rash?: Yes. Use a Rash Mint to apply the Rash stat effect to any Pokémon without changing its displayed nature.