Boss Yo-kai

are powerful enemy Yo-kai which the player cannot befriend or recruit, and are typically stronger than most Yo-Kai the player has met up to that point.

Most of the chapters in the Yo-kai Watch video games end with a battle with one of these bosses, and they are registered in the last few pages of the Yo-kai Medallium, just prior to the Legend Pages; however, they are not assigned any true Rank or Tribe, with the Boss symbol being in place of a Tribe's.

Some of the Boss Yo-kai become befriendable in future games following their debut, giving them a Tribe and a Rank as well as a smaller, more compact form, which is not considered a Boss Yo-Kai.

Boss Yo-kai introduced in Yo-kai Watch 2
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Trivia

 * While Boss Yo-kai do have Yo-kai Medals, it wasn't until the advent of the B Medals did they come around. Even then, they don't play the traditional summoning music of any of the 9 Yo-kai Tribes, but merely an ominous electric guitar.
 * In an addition to that, Boss Yo-kai B Medals do not have any tribe-affiliated insignias on them; rather, they have a slash going through them.
 * In Yo-Kai Watch 3, the bosses are not given the numbers that continue onto Yo-Kai. Instead there is a B-Number and not a regular number