Now that Pokemon from all gens have been retconned to Fairy type and Magnemite and Magneton have been Steel since gen II, Genwun is the only gen that completely lacks a Pokemon type, in this case Dark. Your job is to fix this problem by changing the typing of at least one Genwun Pokemon so that it becomes Dark.

Personally, I'd make Weezing and Arbok Poison/Dark and Gengar Ghost/Dark. This would probably result in Weezing moving up a tier since it wouldn't have any weaknesses thanks to Levitate while also getting a new immunity that would help it against its old Psychic type enemies.