User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4819590-20120206172610/@comment-1006487-20120209210500

Well, afaik guild cards in MH3G are automatically shared via StreetPass if both parties have the option enabled. So basically you would just have to go through a street in Japan and I am sure you'll get plenty of GCs. In MHP3rd/MH3G NPC Hunters from these guild cards will appear in the offline town/hall and give you some extra goodies / go hunting for some exclusive mats (3G).