Items

In the Yo-kai Watch video games, various can be collected and is stored in the player's Inventory.

They can be found in shops, treasure chests, Yo-kai hiding spots, by completing quests, defeating Yo-kai and cranking the Crank-a-kai.

Exporbs and Stanimums
Exporbs are known to boost a Yo-kai's Experience, allowing them to go through multiple levels while Stanimums allow the player to max out the Stamina bar so they can run without getting tired.

Books
Books alter a Yo-kai's perspective of the world, changing not only their Attitude, but how much they loaf around, as well as increase their physical attacks, techniques, and Soultimates' damaging/healing abilities.

Crank-a-kai Coins
These Coins are only redeemable at the nearest Crank-a-kai. In Yo-kai Watch 2, multiple Crank-a-kai are around.

Fusion Items
These items are of no use to the player in their current state, but a trip to Shoten Temple will provide an answer as to what to do with them...