A public service announcement to anyone playing Pokemon X or Y: Do not save your game in Lumiose City! Apparently there have been reports of the game-breaking bug when the save loads, resulting in the city not loading properly and the game not registering input from any controls. The music still plays though, so that's nice.
Source: http://www.gameinformer.com/b/news/archive/2013/10/15/report-possible-game-breaking-bug-in-pokemon-x-and-y.aspx