Good Luck Moment: Just now, I encountered a shiny Espeon on my Leafgreen cartridge. This is the first time I've seen a shiny on that cartridge, and only the second shiny I've found in a Gen III game.
Bad Luck Moment: That same Espeon belonged to a Trainer. First time I have EVER encountered a shiny in-game trainer Pokemon. Also the first time I've ever had to KO a shiny that didn't belong to a human. It was heartbreaking and at the same time...cool. xD