New Legendary: What Yo-Kai Should Unlock It?

So, if you've ever played a Yo-Kai Watch game, or at the very least seen the anime, you'll know that there are incredibly rare and powerful Yo-Kai known as Legendary Yo-Kai, and in order to summon a Legendary Yo-Kai, you first need to befriend 8 specific Yo-Kai in order to unlock the Legendary Yo-Kai. A new Yo-Kai I've thought up is a Legendary Yo-Kai belonging to the Mysterious Tribe, Sherlock Bones. Now, since he's a Legendary, in order for Spike to befriend him, he needs to befriend 8 specific Yo-Kai first. Now, what Yo-Kai do you guys think should be required to unlock Sherlock Bones?