As you would've noticed, the game doesn't offer a way to delete the saves and the recommended method is to simply start a new game and overwrite the existing saves
Saying that, the saves can be deleted by purposely corrupting them (by, say, turning off the DS as it saves), but this has a small element of risk (as someone once found out by accident) and there's a chance you may end up with a partially corrupted save that can neither be loaded from or saved to
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