Well other option is using normal trade. (if it works same as 6) Maybe x/y and oras will get a update that allows you to do this.
Worst case scenario--- get 2 games, capture some crap pokemon with 1.st starter, trow them on gts asking for starter. Then trow in other card, do a *quest* 2 times and trade pokemon via gts.
This is if gts will be up at start of the game.