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Klinks started appearing 50 years before Gen V, and Voltorbs after pokeballs were made. Concept-based mons' existence is tied to the concepts themselves. This is particularly showing in legendaries that are strong pokemon by themselves and usually embody some kind of primal concept like Earth, Destruction, Nightmares, the origin of life, wishing, existence itself etc. that is deeply rooted in human mind, or some strong regional legend like the dog trio, swords quartet or landorus-t and pals.
On the other extreme are your mom's animals that are widespread and comparatively weak.
The source of "strength" of pokemon is drawing power from memes, because they themselves are a memetic-based organic lifeform.
