Pokémon Crossroads will let you explore two of the franchise's best regions, Kanto and Hoenn, and you should definitely check this fan-game out.
I was six when my Pokémon journey began. In 2004, I got a Game Boy Advance SP and went to a local toy store with my parents to get two games — I chose Sonic Advance 2 and Pokémon LeafGreen.
Pokemon FireRed and LeafGreen have two rare exclusives that are supposed to be balanced, but one is more accessible and powerful.