Well I don't have Pokemon white but I do have Black so they should reset the same all you have to do is press B+select+up on the title screen.Hope I helped.
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Press B+Up+Select at the Title Screen to reset the Pokemon White game.
Never in your life reset your game, unless you want to get another starter.
Nintendo has announced that there will not be a third game to be grouped with Black and White. There will not be a Grey.
You will have to delete any saved files for that game to reset it and start from the beginning. You can do this by accessing the memory section of the Nintendo DS.
press x to go on menu and then press save