If you reset your town, it's important to know that if you want to upgrade to the last shop upgrade, Nookingtons, you must have someone either from playing online or playing locally come into your town and purchase at least 1 item from your shop, this only applies to the original DS version and not the Wii U port. But currently Nintendo WFC has been shut down so doing online play officially is no more, so you must use Wiimmfi if you are unable to do it locally. You don't have to hack your DS or 3DS to use Wiimmfi, as there is a method that doesn't require hacking. Hope this helps.