What are the shiny odds with 60 defeated in an outbreak and a level 3 sparkling power sandwich?

Question

I want shiny Metagross, but I don't have a shiny charm (cause I have no friends, sad) and I would like to know how the odds are. Thanks so much!

Answer 1

Your odds are roughly 1/683 in these circumstances. Obtaining the Shiny Charm will increase it to 1/512.

Mass Outbreaks (Serebii)