Br0k3n s0Ul
Br0k3n sOUl
Yeah, most places you should be able to ask for 2 for your copies of XY and ORAS. Now, if you go to other Gamestops for more, that's something totally different.
You can, however, go multiple times if it's convenient to do so. I did it for the Darkrai event and it worked perfectly. I might do it for Arceus and I might do it for Volcanion.