why would you want to? ;( well.. go to the settings and press "data management" and you should be able to take it from there
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You can't delete a game, as they are on the game cards. If you mean the data, you should be able to delete it in the options menu of that specific game.
System settings > data management > click on the title you wanna delete > delete
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 by reset you mean delete your data files then once logged in you simply go to options and then click on erase personal data.
turn on the Nintendo ds and hold in "L, R, SELECT, START, A, B, X, Y, and the directional pad and touch the clubhouse games icon on the ds main menu situated above the downloads play and pictochat ect. it will then give the option "are you sure you want to delete data" obviously select yes thank and i assure you this works for any game