To get more than one starter pokemon than at the begining of the game when you are picking your starter pokemon to rescue professer birch save your game before you pick. Then when you pick and if it is not a girl pokemon then shut off your game then try again until your starter pokemon is a girl. Then with your or someone elses firered/leafgreen and trade a ditto to your game. Then put your girl starter pokemon and ypur ditto in daycare and they will have an egg and it will be your starter pokemon.