Pokemon Silver version. Man, that game brings back soooo many memories. If anyone cares, then I'll explain:
My first Pokemon game I've ever played was the Yellow version, and I loved it very much. However, like almost all RPG games out there, I got bored of crushing the "last boss" (in this case, the Elite Four) millions of times with a party that only gets stronger and stronger. Not to mention, I had no link cables and thus cannot face other players. So I saved up my money (this is back when I was a kid), and after saving up, I bought a new version, which is Silver. I enjoyed it, blah blah blah, picked a Cyndaquil, owned things. Then I started to discover more interesting Pokemon. For example, when I encountered a Chinchou, I was like, "wth, a water/electric type?!" As I kept playing, I learned that I can trade shit from my Yellow version, not only that, but I got to travel to both Kanto and Johto! Also, you face Red, who is stronger than any of the Elite Four members from both games. Yeah, I loved the Yellow version and I thought that was the best game in the world, but the Silver version completely exceeded my expectations; it is al excellent game! Thus I was VERY disappointed with Pokemon Sapphire because despite the advanced technology, it is crap compared to Silver version.