Evolution

is a process in which a Yo-kai changes into a differentform. The evolution process can make the Yo-kai much stronger than its previous form and it will also gain an increase in Rank and power.

There are 3 different kind of ways a Yo-kai can evolve: they can evolve either through leveling up, and through, either with another Yo-kai or with an item.
 * Yo-kai that evolve via leveling up can cancel their evolution as well, but they will evolve following the next level up. Those who evolve via fusion cannot.