I remember one day, while I was playing my Japanese Platinum, during the story, I'm around Route 221, when all of a sudden, I see a shiny Girafarig!
I'm like, "Oh my Gosh, I have to catch it!." Luckily, a Quick Ball catches it, and voila, my first shiny Pokemon in Platinum was caught, however, I would later trade it sadly to get some cool Pokemon, but ah well, it was a cool experience.
In my American Pearl, I got a shiny Milotic off the GTS, but the thing is, its hacked. I probably will just use it to breed for Feebas and then give it away, since I really don't need it.
Oh yeah, since I have an imported Soulsilver from Japan, don't forget the shiny Gyarados. Since I caught it (yeah, at least I can
really have a shiny Pokemon thanks to it), I can't wait to breed it to get shiny Magikarps (through the Masuda Method, if it will work our for me).
I also can't wait for the Shiny Pichu event. Who knows if I will evolve it? I even want the Shiny Eevee that will be given out in VGC this year (if I'll participate, but I do have an idea of what may be my team anyway).
So yeah, at least we all can gain some shinies through Nintendo Events. They'll definetly be worth it (really the Shiny Eevee since you can evolve it to a shiny Eeveelution).