Brushido in Yo-kai Watch 2

Brushido is automatically befriended at the end of The Vanishing Watch in the main storyline.

He can also be found underneath cars, vending machines, and in garbage in Uptown Springdale, Desolate Lane and in the kitchen area of Wolfit Down as well as the dining area on a team with Flushback.

He can randomly be battled (but not befriended) by washing your hands. Upon defeating him, you will obtain some Food items such as Boiled Egg, and find a Gold Tag in a cutscene following the battle.