go to new game
make a new file and save it
on the menu list where it says continue game, down you will find a box that says new game you press it save and press yes and you will delete the other file and have a new file.
Go on to delete
how to delete a file using keyboard
Navigate to the file and click the Delete File link
You can delete it by going into Windows Explorer, finding the file, right clicking it, and clicking delete.
The only time any GBA or DS game ever does that is if the cartridge (game pack) itself is damaged.
Just right click on the file and click "Delete File(s)" UPDATE: IF IT WONT DELETE YOUR SCREWED!
If it is a file delete the file. Or if it is REAL MALWARE then scan your system and delete it. I myself delete harmful .vbs files off of the internet.
in lilycove city
Just use 'Search' to find the file and then delete it from the file/folder.
Start a new game and when you save it will say that there is another saved file do you wish to replace it? Click A on yes. The other file will not be there but your new one will. Note: You can not have two saved users on Pokemon Emerald or any other game of Pokemon for GBA or GBA SP or Nintendo DS.