After you fight Professor Sycamore in Couriway Town he says there is an item hidden in the town. Of course there are several but looking at Bulbapedia none of the items listed seem especially notable besides the Gyaradosite which you can't get until after you beat the Elite 4 anyway (as far as I have heard).
So does anybody know which one is Sycamore's 'special' present?
Best Answer
I read this answer on GameFAQs. Check it out.