Pokémon LeafGreen, and its retail buddy Pokémon FireRed, are remakes of the original Pokémon games. Released for the Game Boy Advance in 2004, LeafGreen and FireRed are 3rd generation Pokémon titles and the first remakes in the series. As such, there are major improvements over their originators. However, the improvements are primarily relegated to updated graphics, which are much more detailed compared to their Game Boy brethren. There is a decent amount of new post-game content too, mostly introducing Pokémon from newer generations. It’s a solid title, with the toughest Elite Four in the series and a selection of Pokémon that isn’t completely overwhelming.
By the way, the theme for the 4th and 5th Sevii Islands totally rocks. It’s so hot, I have it on my iPod!