Pokemon: A Grand Day Out is a game made from Pokemon LeafGreen – the twin brother of Pokemon FireRed (and it is also the incarnation of Pokemon Green on Gameboy Color). This hack is not the same as the others on PokeCommunity.
Pokemon Advanced Adventure is a special ROM Hack that is based on Pokemon Leaf Green. After hundreds of Hack ROMs we posted, it is the first hack that uses Pokemon Leaf Green Engine. After 4 years in development, this hack is completely finished.