What does the Naive nature do?

Naive raises Speed by 10% and lowers Sp. Def by 10%.

What stat does Naive increase?

Naive increases Speed by 10% and decreases Sp. Def by 10%. HP is unaffected.

A Naive Pokémon likes Sweet flavors (tied to Speed) and dislikes Bitter flavors (tied to Sp. Def).

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

Nature

Raises Speed, lowers Sp. Def.

Raises Speed +10%

Lowers Sp. Def −10%

LikesSweet

DislikesBitter

Fast mixed attackers on offensive teams.

Timid −Attack Hasty −Defense Jolly −Sp. Atk

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