Boss Yokai

All boss yokai, with the exception of Komassive can be befriended in the postgame

Megatoria
Megatoria is the first boss in the game. He appears in Downtown Springdale near Foundation Academy after complaints of food being stolen from vending machines are noticed. After finding him, he will initiate a battle, and after defeating him, you will get his medal.

Komassive
After Komasan is taken hostage by Paranora, you will travel to Midnight Village, just north of Blossom Heights. Paranora causes chaos by turning Komasan into the giant boss yokai: Komassive. After this you will battle him and after defeating him, you will earn his medal

Gargantula
Gargantula is the third boss in the game and he is encountered and fought at Airdale. After arriving at Airdale, you will have to go to the park at night and into the small forest area that is covered in Spider Webs. The Boss, Gargantula will appear and attempt to eat you, starting the battle

Klefnote
Klefnote is the fourth boss in the game. It is encountered and fought at Performer's Stage. When you get to Performer's Stage, you will see Next Harmeowny on stage, and jibanyan will pull you over to the stage. The boss Klefnote, then drops down onto the stage and begins to battle yo

Belly Bronze
Belly Bronze is the fifth boss in the game. It is encountered and fought at Dreamer's Field. He is a giant

Wavester
Wavester is the sixth boss in the game. It is encountered and fought at Sanfantastico

Himaloonie
Himaloonie is the seventh boss in the game. It is encountered and fought at West Walan

Buddha-Pest
Buddha-Pest is the eighth boss in the game. It is encountered and fought at Temple Park

Paranora
Paranora is the ninth boss in the game. She is encountered and fought at Factory Row

Lord Enma
Lord Enma is the tenth boss in the game. He is encountered and fought in the Yo-kai World

Wrathdox
Wrathdox is the eleventh boss in the game. He is encountered and fought in Uptown Springdale

Mammothoria
Mammothoria is the first boss of the Ethereal Corona, and it is encountered in the 1st Oasis. It is an alternate version of Megatoria