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My first shiny was a Weepinbell back in Silver, back before I knew what shinies are. I must have blinked when I encountered it, because I didn't see the shiny animation. I thought I might be crazy, and that my friends wouldn't believe me, but I was pretty sure that the Weepinbell was a slightly different color. I caught it anyway and left it in the box. I checked it every now and then, but never caught a normal Weepinbell to compare it to. I told a friend about it, but I don't think he believed me.
I'm kind of impressed at my childhood autism to even tell the difference. It's really subtle.