I saw a shiny Zubat when I was looking for a Teddiursa in Crystal. In the Dark Cave.
I wasn't really paying all that attention to the screen, due to me getting ticked off when Teddiursa refused to appear, and when the little thing did, it ran away. Hypnosis phails.
Anyway, I heard a little sparkle thing, so I went "WTF" and saw a purple Zubat. It was level two. But I somehow didn't kill it and caught it, and trained it. I realized then that I hate Zubat and it's line.
After awhile, my Crystal sucked. So I started over, and forgot about my Zubat (that had evolved into a Golbat by then). I didn't really care.
On my next playthrough, after trying to hatch my egg into a Pichu or Elekid, a shiny Cleffa pops out. I debated on keeping the shiny Cleffa, but I screwed it and kept going. I never did get an electric pokemon... It was like I was doomed to Cleffa.
So I deleted THAT game, and now I'm going yet another playthrough. Will I find a shiny this time? Will I delete the game? WHO KNOWS! *mystery*
In LG, I ran into a shiny Paras. I caught it, but I'm pretty sure my cousin deleted that file. I wasn't affected.
And the red Gyarados of course.