Pokemon-go – Can a Pichu wearing a Santa hat hatch from an egg

Well when you go out walking, be sure to go out in a STRAIGHT PATH. Try not to venture left or right. Just go down a road and take it to the end, as the gps system has shown to take your starting point, your end point (after x amount of minutes), and compute the shortest distance possible, disregarding walking along streets.

I haven't really experienced this issue of not hatching, or I haven't noticed it. Perhaps its also just your connection that suffers, or perhaps its really a bug. Either way, I've never had an egg stall for more than a day like this. (Edit)

I know this system is weird and unusual, but it's been reported that way. It's like the different between Distance and Displacement, in physics terms. You run a lap around a track. Distance says you ran 400m, but Displacement says you ran 0m because you're in the same spot.

http://comicbook.com/2016/07/21/pokemon-go-eggs-may-not-work-the-way-you-think/ This is just the first site I saw that mentions the tracking system, and the information is conclusive with reports. If you need more information, just search "Pokemon Go eggs tracking system" in google. Click any page that relates to misconceptions/untold secrets/incorrect. These are the pages that acknowledge how the system is different from a normal GPS

As long as your app is working properly, you simply need to walk with the app open. It's more likely to work if you walk outside in a straight line (vs. inside in circles) since it is likely sampling your GPS location every N seconds to determine distance.

Your experience could be caused by the app getting into a semi-frozen state where you can still perform most interactions with the app, but some aspects are broken. Some indications of this I've seen include the animation in the upper-left corner going continuously and images not loading for pokestops.

I'm able to fix by killing the app and restarting. To kill the app in Android, open Settings, select the "Apps" menu, scroll down & select Pokemon Go, then touch "Force Stop". It will warn you that the app may misbehave. Say "Ok", then open the app normally---you should see the Niantic logo initially.