And, apparently, last weekend as well. Thanks to Matt for the tip on this.
Deoxys is a Pokemon that you can only obtain through special events. You cannot get one in the actual game, which makes it pretty rare. GameStop is having one of those special events.
From the GameStop Blog:
Unfortunately, I did not know about it last weekend, and this coming weekend we will be traveling. So Unless they have a GameStop in the Atlanta Airport, my daughter and I will have to wait for the next such event.
[Addendum: GameStop has this going on Friday, Saturday and Sunday, not just Saturday and Sunday, so we might get Deoxys yet!]