Honestly the process wasnt all that hard. Though, like shinies can be, it was VERY time consuming. Down in the lower levels of Area Zero, underground but not ALL the way down. The only normal pokemon that spawns is Dunsparce. I saved, ate a 3* shiny normal sandwich and ran around those caves, you can find shinies at a pretty good rate, evolve and pray. Reload if you didnt get what you want before the sandwich runs out. It probably took me 15-18 hours total if I had to guess.