weavile999 answered your question:Hmmm, I seem to have received a code for the ORAS…

Do you get a bonus in the real game for having played the demo or is it really just a demo?

Items are received for playing through the demo multiple times, and can be transferred to the main game.  Also, the demo is the only currently known way of obtaining a Mega Stone for Glalie (or Steelix in the Japanese version).