POKEMON SHINY GOLD

how do i save on pokemon shiny gold?its says that there is a previous file and i cant same due to an error?how do i fix it?im playing on r4

Was there already a previous save file, and you've gone to new game and are unable to save? If so there's a button combination you need to hold down on booting the game to delete the existing save in order to be able to save. If this isn't the issue you're having then I've got no idea

Rename the save? ???