>>52596288Hey anon you may have already figured this out but just in case you haven't and as a tip to anyone else who gets an Eevee outbreak near the olive field:
Stand in this spot and cast picnic and you'll spawn nothing but Eevees and you can just keep recasting your picnic until a shiny pops up
You'll have to take some half steps to unroll your picnic and rotate a bit, plus position your camera, but hunting here can be somewhat optimal considering you know nothing will spawn behind you
It takes some patience but I've caught I've caught 9 shiny Eevee this way