Darknyan is actually a transformation of Hovernyan.
Darknyan is a cat Yo-Kai with black and gray fur with golden yellow eyes and a fading blue stripe on his face. His nose is blue, while his inner ear, muzzle, chest and paw tips are gray. It has pale pink blushing cheeks. Around his shoulders is a sapphire cloth worn like a cape, and around his waist is a utility belt.
Yo-kai Watch (anime)
Darknyan first appears in M01 after being powered up by the Yo-kai Watch and the Yo-kai Watch Model Zero by Nate and Nathaniel.
Yo-kai Watch 2
Darknyan can be befriended after beating the main story. The player must first obtain the Dark Bell by scanning the QR code as shown to the right.
In Fleshy Souls and Bony Spirits, Darknyan will immediately appear and can be found in the warehouse where Dame Dedtime was fought.
In Psychic Specters, player must complete the post-story quest 'The Darknyan' by talking to Hovernyan, who can be found on the top of Mt. Middleton of Harrisville in the present. After completing the quest, Hovernyan, now Darknyan, can be found in the Gerageland of the Yo-kai World and can be befriended through the regular method.
Yo-kai Watch 3
Darknyan can be befriended by completing the Yo-kai Ring 'HEROOOOO!!', To complete the ring, player must befriend the following Yo-kai: