http://www.nintendodsicards.co.UK/fake-iedge-cards
for more information as to how to tell fakes from original cards.
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If speaking of a Nintendo DS, it is a ROM file. It's like insides of the game card packed into a file, bootable by the DS or an emulator.
YOU CANT! send it to nintendo.
impossible
Nintendo DS save data is saved to the game card, not the console. For most games there is a button combination or menu selection to delete the save data. L+R+A+B+X+Y while the Nintendo logo is displayed will work for many Nintendo games. If you are using an R4 or other flashcart, you can simply delete the file [ROM filename].SAV
if you are talking about the NINTENDO event at Game Stop, no. i know of someone who traded a Snorunt from another file onto their newly started file...