Yungoos and Gumshoos have a “detective” theme because Rattata and Raticate have a “thief” theme! Notice the little moustache that Rattata has(like Froakie)it’s kind of a Japanese way to communicate “thief” because cartoonish burglars carry their bags over their heads and a cute moustache-looking knot under their noses. I think the idea is that Gumshoos is the detective who prowls for its prey at the wrong time of day,while Raticate is the fat mob boss whose underlings sneakily steal food for it.
Hmm; this works. My approval of Gumshoos has risen!
Pokémaniacal 