Though its largely to interact with the Dragon Quest X Wii game, so sounds like it has no function if you don't have the game *sadface*
http://www.nintendolife.com/news/2012/07/dragon_quest_x_app_adventuring_onto_3ds
It is still cool though, and I hope other games will continue in this vein. Though I will never own a Wii.
The Official Nintendo 3DS Guild
A guild where all the Nintendo 3DS owners can come together.
