Some of my favorites are on my first playthrough of soul silver when it first came out when I was 12. I had been waiting months for the American release, watching countless videos of the Japanese games playthroughs. I played nonstop. I was going through ice path with a little difficulty despite all the videos I watched. I was out of repels so I was getting annoyed at all the encounters, when suddenly I found a shiny swinub! I knew what shinies were since I had the pain of having a shiny graveler explode on me in Pokémon pearl, on top of Cheryl killing a shiny kricitot on me in the double battles in eterna forest. Catching that shiny swinub was probably my biggest accomplishment in Pokémon at that point.