Original: Red and Blue have subsequently been remade for the Game Boy Advance as Pokémon FireRed and LeafGreen, released in 2004.
Simplified: Pokémon Red and Blue have later been remade for the Game Boy Advance into Pokémon FireRed and LeafGreen, released in 2004. Pokémon FireRed and LeafGreen Pokemon FireRed and LeafGreen are for the Game Boy Advance are new versions of Pokemon Red and Blue.