Boss Yo-kai

are powerful enemy Yo-kai which hold the distinction of not being befriendable with the player, with counted exceptions.

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 show no class, as well as no rank and they do not pronounce their name when displayed.

Some of the Boss Yo-kai from the first game were given recruitable Friend Forms in Yo-kai Watch 2, giving them a tribe and a ranking, but those forms are not considered 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.