What does the Jolly nature do?

Jolly raises Speed by 10% and lowers Sp. Atk by 10%.

What stat does Jolly increase?

Jolly increases Speed by 10% and decreases Sp. Atk by 10%. HP is unaffected.

A Jolly Pokémon likes Sweet flavors (tied to Speed) and dislikes Dry flavors (tied to Sp. Atk).

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

Nature

Raises Speed, lowers Sp. Atk.

Raises Speed +10%

Lowers Sp. Atk −10%

LikesSweet

DislikesDry

Fast pure physical attackers. The speedy counterpart to Adamant.

Timid −Attack Hasty −Defense Naive −Sp. Def

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