Kyubi in Yo-kai Watch 2

In the second game he plays a minor role as one of the Fleshy Souls being Toadal Dude's second in command.

Kyubi can be befriended in the Fleshy Souls exclusive quest The Old Fox Shrine. After beating him once Kyubi can be fought daily on the school roof until befriended normally.

There is a second Kyubi in the sidequest exclusive to Psychic Specters, A Real Charmer. He appears at the base of Excellent Tower, which you can reach by taking the train or using Mirapo's Warp. This Kyubi is a student and still training to become fully-fledged, and as a result he's younger than Springdale's guardian. His subquest involves finding girls for him to charm, and then collect the Heart Orbs that are created by successfully charming them. This quest ultimately requires finding and talking to the majority of female NPCs in Springdale, and though Kyubi successfully charms most of them, three characters prove hilariously immune to him.

Version exclusive: Yo-kai Watch 2 Fleshy Souls.