He first appears at the "Evil Villain Meetup".
He later on saves the world defeating Perfect Chaos around the end of the episode by flying into it riding on to a bag of doritos, which then catapults him into far into space. It is unknown what happened to him after.
The second hes seen seen with a golf club as the camera follows Waluigi's golf ball through space after it collided with a bullet bill. He appears to be playing a game of golf with Ztar.