Yamask is a pure Ghost type with an alright design, it's one of those that is a good design, it just doesn't really appeal to my likings. Anyways, Yamask has meh stats & meh abilities, but it has an alright movepool. Yamask is one that I don't really know as much on since I've never used it at all, but I wouldn't quite go to say it's necessarily forgettable, it's more kind of in the middle between forgettable/memorable. Ultimately ranked Yamask here because just doesn't have as much appeal as the rest.
Boots22 The Pokedex entry is what makes this one so memorable. I mean, it carries around the face it used to have when it was a human. If that isn't a tear-jerking Pokedex entry, then I don't know what is.