Interesting... I've removed plenty of unwanted skills before, and this has never occurred to me... I dunno what chapter you're on, but your only option might be to start a new file. This might be something for @Soaprman to look into, if it's a bug. Or maybe you're just unlucky. Either way, a value in your game's castle data got changed when it wasn't supposed to be. And if you want streetpass back, my only suggestion would be to just start again. Sorry, mate.yup, then I imported my Chapter0 and my castle was gone and this bug started happening.