What are the percentages of finding each Evolution Stone in the Underground?

Question

Specifically for BDSP. I’m currently looking for Shiny Stone to evolve my Roselia but I can’t seem to find one.

Comments

Dont know if this will help you, but there is a shiny stone on Iron Island and on Route 228

Answer 1

According to Serebii, they can go from "extremely rare" to "rare". If there were actual knowable percentages, Serebii would have them.

A Shiny Stone is not available in the Grand Underground, it is the only evolution stone besides the Ice Stone that is not there.

Source