If you want another lucky egg ( I'm assuming you play white or black ) On Route 13, there is a man wearing sunglasses who will give you different items everyday. One of these items will randomly be given away each day by this man. If you want to get a Lucky Egg from him, you will have to be committed to talking to this man each day until you obtain one, The only other way to receive a Lucky Egg, is to catch or hatch a Happiny, Chansey, or Blissey, who MAY be carrying a Lucky Egg.
* Happiny has a 5% chance of carrying one.
* Chansey has a 5% chance of carrying one.
* Blissey, surprisingly, has a 100% chance of carrying one.
So, there are a few ways to obtain a lucky egg. Your best bet is to get one from the man wearing the sunglasses on Route 13. Hoped this help. (: