Either press new game and save over your file or press B Up Select on the title screen then say Yes.
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1. Go to Pokemon (Put version here) Nintendo on the DS, DS lite, or DSi. 2. Press Up, B, and Select at the same time. 3. Press "Yes". 4. Press "Yes" again. 5. Be patient if you were very far in the game. 6. Once it is done, press A. Congratulations! You have learned how to delete your saved game file. But since you did, there is no way to restore the data that has been deleted.
You can't. If you want to create a new file, you can just save it over top of an old one.
in the gameboy color games you just start a new game and save over the old one
You can get it in Vermillion City in the house that is next to the Pokemon Center.
You can't without using cheatcodes. The Old Sea Chart is only obtainable and useable in Pokemon Emerald.