All you need to do is start a new game, and then save it. The game will warn you that there is other data on the game card and if you click yes it will wipe the card clean, letting you start a new game.
OR
Go to where it says Press Start and if you want to delete everything you saved, pres Up+Select+B. it will erase everything, it asked you if you want to or not.. so make up your mind over there
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i have had no experiences with it and i do it a lot on platinum
Depends on which cheat code you entered, you can probably delete off your Action Replay and save it.
u cant. u have to delete the first file in order to create another one.
yes
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.