RE: Your very first shiny!
My first? I think either s hiny diglett in the diglett cave place in LG (That somehow vanished from PC even after saving 2000000000000000 times)
Or a shiny FREAKING ZUBAT! IN DIAMOND! Of all the shinies, had to be zubat, I rebagan the game over. Then, after saving it, remembered Zubat, and a crapton of legendaries.
Then, that began my odd shiny luck. I caught them when I wasn't even thinking of shinies. And never, ever when I did a shiny hunt.