In order to delete a save file in Platinum, start your Platinum game and go into the title screen aka the screen where it shows Giratina at and where it says "Press Start." Next hold down the B button, the Select button and Up on the D-Pad all at the same time, it'll ask you if you want to delete the current file then.
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Depends on which cheat code you entered, you can probably delete off your Action Replay and save it.
Because if you have gameshark/action replay for GBA and save it. It get's deleting yr file
you can't
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Press up, select, and b