Essential Handbook - Yo-kai Watch Author:Scholastic All 200 Yo-kai, all in the same big book! The Medallium (named after the book in the show / video game that Nate uses to collect all his Yo-kai medallions) has all the stats and facts kids need to know about over 200 funny, fantastic Yo-kai. It's an absolute must-have for Yo-kai fans of all ages.