What does the Docile nature do?

Docile is a neutral nature. It does not raise or lower any stat.

Can I change a Pokémon to Docile?

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

Nature

Neutral: no stat is raised or lowered.

No stat is raised or lowered.

Filler nature; no competitive upside or downside.

What does the Docile nature do?: Docile is a neutral nature. It does not raise or lower any stat.
Can I change a Pokémon to Docile?: Yes. Use a Docile Mint to apply the Docile stat effect to any Pokémon without changing its displayed nature.