Where do I get a Shiny Stone in USUM?

Question

Because my friend is trading a shiny Roselia up to USUM and then he will evolve it after it gets good moves.

Comments

Or should I tell him to get it in XY?

Answer 1

Non-repeatable
- Mali City's flea market for $3000 (Ultra Sun only; after beating Nanu's trial
- In the north of Ancient Poni Path, in an alcove west of the Vast Poni Canyon entrance

Repeatable
- Isle Aphun on Poke Pelago (Brilliant-Stone Hunting, Interesting-Item Hunting)

I'm not sure why the other answer thinks Chansey/Blissey can hold them. This has never been true.

Shiny Stone (Bulbapedia)

Answer 2

Chansey/Happiny sometimes hold them, and shiny stones are available in PokePelago.

Comments

Thanks.