I remember my first shiny. It was a tentacool on Pearl version (my first game, every time I hear Twinleaf Town's theme I'm overcome by nostalgia). The moment I saw that it was purple and green I think I nearly screamed or fell off of whatever I was sitting on (this was nearly four or five years ago, my memory isn't that good ) When I caught it I was ecstatic. Thing is, I never evolved her for some reason. I think it was because I saw what a shiny Tentacruel looked like and I didn't like it. Meanwhile in White 2 I'm trying to get a shiny Virizion by soft resetting. So far, no luck.