>>52437968I didn't have any until I complained about not having any after my friend showed me his shiny Flittle, less than five minutes after which I immediately found my own shiny Flittle. If you want guaranteed shinies you can just look for outbreaks, autobattle with a throwaway pokemon you don't care about overleveling until you get three notifications about the outbreak getting smaller, and then set up and put away picnics to refresh the outbreak until one shows up. Post-game shiny sandwiches help with this, but your odds improve after the three notifications regardless