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Have encountered 4, all post gen V. First ever randomly encountered shiny was a Sewaddle in pinwheel forest. It's weird because the second I booted up the game I just felt "lucky" and knew I was gonna get a shiny for some reason. Feel like I should've played the lottery, but I love my little bug.
Sometime later I learned about the Masuda method and thought I'd try it with Oshawott. I was 3/5 eggs in and thought "This is so fucking boring, I quit." I was just gonna hatch the rest of the eggs and ended up with a shiny Oshawott on egg 4.