Yungoos
The Loitering Pokémon
Type: Normal
Official Registration #: 734
Entry: A notorious example of introduced species, this mongoose-like pokémon is a carnivore native to Asiatic and African regions, not to a Pacific region such as Alola. However, in the mid- to late-19th century, yungoos were introduced to the Alolan Islands by berry farmers wishing to control the local rattata populations. This, of course, is mildly amusing (that is to say, horrible) for two reasons. First, rattata—including and especially the dark-type Alolan variation—are nocturnal, whereas yungoos are primarily diurnal, meaning the two rarely to never cross paths, and due to the relative newness of the field of behavioral pokémonology, this was not discovered until after mass amounts of yungoos were released into the Alolan wild. Second, rattata was an introduced species itself, meaning human beings are, in general, fantastically terrible at the whole concept of preserving the environment.

Gumshoos
The Stakeout Pokémon
Type: Normal
Official Registration #: 735
Entry: The evolved form of yungoos, by battle experience. Due to its incredibly patient nature, combined with its incredible hunting abilities, gumshoos had been introduced to the Alolan environment shortly after it was determined that its preevolution had failed to control the local rattata and raticate populations. However, while it is indeed true that gumshoos’ favored prey are rattata and raticate, this mongoose-like pokémon’s signature patience and dedication to hunting said rattata and raticate were still not enough to overcome the problem that is the fact that the entire yungoos line consists of diurnal pokémon attempting to hunt strictly nocturnal prey.

(You could even say that gumshoos failed to make Alola great again, but the author has been told by his editor that he is under strict orders not to make such a joke.)