How do IVs on legendaries work in Sun/Moon?

Question

So in ORAS, I learned that legendaries always receive 3 perfect IVs upon capture. I don't have Sun/Moon yet, so I want to know what happens to IVs here (I know we can edit them now thanks to Bottle Caps). If we can simply edit them ourselves now, did they remove the automatic 3 perfect IVs?

And about Cosmog... if it's an evolving Pokemon, does it get those 3 IVs too?

Answer 1

Yes. It's practically the same as ORAS. Every legendary is guaranteed at least 3 perfect IVs.

Source: Knowledge and experience capturing legendaries