If the game doesn't have a menu option to do so, or in the case of the Pokemon games, a specific set of keypresses described in the manual, then there's no real way to 'delete' the saved games, apart from overwriting them with newly started games.
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I dont think you can.
you have to delete the hole game its self and then get it back on your d.s but you also have to delete the saved data.
goto options and goto last scroll on bottom off system update and click it when your done the games will still be in the shop for free and you can download it any time you want.
No, it keeps your save games but gets rid of anything you've done since last saving it. Just like turning the console off and on again.
you dont