Tengu in Yo-kai Watch 1

To befriend Tengu, complete the post-game quest Take Out Tengu!, which's received from Eddie's mother in Breezy Hills. First, collect a Typhoon Fan, which is dropped by Greesel in the 1st and 2nd circles of the Infinite Inferno. Then go to the Rugged Path in Breezy Hills and inspect the rock at the end of the upper path. Tengu will appear to fight you, and then befriend you once you defeat him.