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I assume you mean non-handout shiny? I've been playing since gen1, usually putting in 200+ hours into each gen (either in a single game or between the initial and 3rd versions or replays), and my first shiny wasn't until gen6. I was playing Y and I had just gotten Rock Smash, so I decided to give it a go to see what I could find, and pic related hopped out.
Honestly, I'm glad it was an interesting pokemon and not one that most everyone else already has like a Tentacool or Wingull