There is a Delete all files thing in options. took me a bit to find it too.
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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.
In order to delete your data, click on main menu, and click on the cat profile you want to delete and in the bottom right corner it says delete and click on it.
You can't. If you want to create a new file, you can just save it over top of an old one.
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