I was having trouble with this myself, then I figured it out by accident.
If you want to restart the game, save your game, then remove the cartridge when it warns you not to touch the cartridge or switch the power off.
It will corrupt your save file and the game will delete it when you turn it back on.
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First, you pull the ds stylus out of your ds, stick it in your ear. give it a bit of nudging. get the ear wax out and clog the ds slot wid it
LOL Idiot U Cant Gotta Turn The Whole DS OFF Then On Again
Press: The L button, located on the back of the ds, the B button, located on the key pad, and the Select button, Located underneath the keypad and Start button x
press lbx and select all together at the same time.
How do you delete a game in petz puppyz and kittennz game for nintendo ds