Whats the best nature for a umbreon with this moveset

[Bitoko]

Confuse Ray
Toxic
Mean Look
Dark Pulse/Moonlight

EDIT: woops, wrong place.. but could you answer the question?

[Mysticjason]

Well... It would probably be bold or calm.

[Pokemaniac28]

Impish could work too, since hes probably not going to attack.