I found my first shiny hatching an Eevee I planed on evolving into Glaceon. (This was when I was noobier then I am today.) For some reason, I was running through the grass near the icy rock. (Again, noob days) when I ran into a Shiny Snover. IRL, I ran to the bottom of the stairs leading to my sister's room screaming at the top of my lungs, "SHINY POKEMON! SHINY POKEMON!" I remember that He had a Bashful Nature; I taught him Blizzard, Shadow Ball, and Giga Drain; and I was forced to delete the save file when I glitched it up messing with a Cheating Device. I could have gotten another one with said cheating devise, but it wouldn't have been the same.
My second nonhunted shiny was a Spinark. I found it on the day Heart Gold came out in the US by looking for Heracross in the wrong area. when seeing it come onto screen, I thought, "Another Spinark..." then did a double take. "Wait, was it BLUE!" As It sparkled, I said in awe, "Shiny Pokemon." After catching it, I saw that it had a Rash Nature and decided to teach it Giga Drain to take advantage of its boosted Special Attack. This was after I became less noobish and knew that Ariados's base Special Attack was 40, but I thought it was worth a try. It relised it sucked after dealing pitiful damage against an Onyx of about the same level.