I believe in SUMO/USUM on Hano Beach there are sand spots where when you walk into them you will encounter either a Staryu or Sandygast. If I save in front of a sand spot and repeatedly encounter it, can the Pokemon be shiny? I'm aware that the Pokemon that comes out isn't always the same, but I'm curious if it could be used as a shiny hunting method. The reason I ask this is because I heard that SOS hunting isn't that easy in USUM compared to SUMO due to lower call rates, so I thought I could use this in hopes of getting a shiny Starmie/Sandygast for my team.
Any reply would be helpful!