Golett and Golurk
Speaking of fantasy monsters, our first ever ghost/ground pokemon appropriately wound up being a Jewish golem, and a pretty cute one at that. An ancient civilization supposedly fashioned these beings from clay and brought them to life by a now forgotten means, which you may recall is the same story behind Baltoy. I'm glad that's not a purely one-off thing. The idea that humans knew how to make pokemon thousands of years ago is just such a cool theme for these artifact-based creatures.
The evolved Golurk is even more explicitly modeled after the Golem of Prague, and I love the simplicity of that little head, with only eyes, atop such an imposing body. Hilariously, this thing also learns Fly, the implication being that it can rocket through the air in the fashion of so many giant robots.