What's the best nature for the Ultra Beasts?

>>30280771
Naive for Pheromosa

>>30281003
Modest for Nihilego?

>>30281003

What build? Everyone seems fond of a mixed set with life orb and U-turb but I don't know the build.

>>30281003
I caught Pheromosa with Rash, Naughty and Naive natures, it has a good mixed movepool and the loss of SpD is minimal.

I need to ask, what is a good nature for Celesteela? I'm planning Adamant but it just has a huge mixed movepool I can't decide.

>>30280771
Timid for Nihilego, it passes the 100 Base Speed stat so is better not to waste that out. Modest for Xurkitree.

Adamant or Jolly for Buzzwole, its got high attack and good speed.
guzzlord i got no fucking idea.

I got:
>Nihilego - Timid
>Pheromosa - 2 Native, Naughty, Rash
>Xurkitree - Modest, Rash
>Celesteela - Modest, Brave
>Guzzlord - Quiet

These are the ones I got:

>Nihilego
Modest

>Pheromosa
Jolly - Naive - Naughty - Docile (I asume Naive/Hasty is best)

>Xurkitree
Jolly - Modest (Timid is best for it)

>Celesteela
Impish - Rash

>Guzzlord
Impish (Adamant probably best)