Click new game at the menu
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make a new file and save it
just start a new game. there will be a warning, just ignore it and it will delete the file as soon as you save in the new game.
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.
find the file you designated to hold pokemon fire red files, each save should be numbered, right click and select delete. Done
all you have to do is start a new game and save on your new game file what is a new game file?