Where to find fossils in Poke-Pelago?

Question

What it says on the tin I guess. Serebii says I can find fossils in the PokePelago, but their Pokepel page doesn't show which expedition can I find fossils in. Mind you this is S/M.

Answer 1

You can't find Pokemon Fossils in Poke Pelago in Sun and Moon

You can only get the fossils on Poke Pelago in Ultra Sun/Moon. You can only get fossils from the Sinnoh and Unova from buying fossils at a shop in Sun and Moon.

In Pokémon Sun and Moon, only the Fossils from Sinnoh and Unova are available. Their location is at Olivia's jewelry shop in Konikoni City, where the player can buy a Skull Fossil and a Cover Fossil in Pokémon Sun or an Armor Fossil and a Plume Fossil in Pokémon Moon

Source

Also, when you go to see what items you can find in Poke Pelago, all of the fossils have the USUM symbol next to all of the fossils you can find in Poke Pelago.

Source