Dragon Quest VII 3DS contains StreetPass stone swapping feature

Much like Dragon Quest IX, the 3DS remake of Dragon Quest VII will contain a sharing component. Players will be able to trade stones with others via StreetPass.

Each stone has a carving and is tied to a Monster Park. As soon as three stones are collected in a set, a monster will show up in a cave to fight. Users will be able to face a variety of different monsters through the described stone system.

Source