In Lumiose City, there is a very convenient circular walkway surrounding the big pokemon building (it's yellow on your map, and resembles the Eiffel Tower). The path serves as a very nice endless road, perfect for hatching your new babies. Find a spot where you won’t bump into anything and start marching! You can place a quarter or some other coin to hold the circle pad slider in place. Your trainer will roam around in circles and you can leave to do something else. When you return to your system, you should have a new level one hatchling.