Yo-kai Cam

The Yo-Kai Cam is a feature in Yo-Kai Watch in which you take pictures of peoples' faces and find Yo-Kai inspiriting them. Finding certain numbers of different Yo-Kai will unlock rewards, redeemable at the in-game post office.

There are also challenges where you have to find a certain class, rank, or type of Yo-Kai. Doing so will also unlock rewards.