Jibanyan S can only be found in Yo-kai Watch 2 by downloading the Oni Evolution Update for free, from the Nintendo eShop.
After completing the main storyline of Bony Spirits, he can be found at the intersection near The Fish Place in Uptown Springdale. He can be battled once a day until he's befriended through the regular method. Unlike other Yo-kai, he can be befriended as many times as he likes.
Connect Bony Spirits with Yo-kai Watch Busters, then complete the second story, talk to Wiglin and select the first option to receive the Ganso Manju. In the basement, talk to Slitheref to meet Jibanyan S. He can only be battled once a day until he's befriended through the regular method.
When the game is connected with Bony Spirits, the player will receive a Bony Bell from the Post Office. That item can be used to battle Jibanyan S, where he is located in the East Cashew District of St. Peanutsburg. He can be battled once a day until he is befriended through the regular method.