Pokémon Gold Version & Silver Version
Game Boy Color / Game Freak / 1999
These games were pure awesomeness. Gold & Silver were a massive improvement over it's predecessors and were the real definitive Pokémon versions for a reason. They were just incredibly memorable - the soundtrack was gorgeous, the graphics were great and still hold up today, the new additions were fantastic when it came to new monsters, items, moves, types and even more, and obviously being able to explore two regions was amazing even if the Kanto region was a bit short on content probably due to hardware limitations. These games were a big part of my childhood and for a very long time were my favorite entries in this franchise (I even like them way better than their remakes, to be honest).