Luigi is a somewhat mentally unstable plumber/janitor who actually came from the Mario Series. Nobody notices this often because those shames suck, just like those of the Pokemon series. He is known for sucking up the remains of Groudon and Kyogre with a vacuum cleaner while they were talking about politics. He later put them in his famous dust collection. He can be battled in the Generation 3 shames in a shed in Somewhere where he has a Pokemon that shouldn't even exist yet. He also appears in the anime.