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>Meant to represent monsters, not animals
>Meant to purposely be unappealing to the human eye, evoking emotions of disgust, disturbance, creepiness and overall being unsettling
>Based off of real life dark/lovecraftian mythology and other fairy tales (fairy tales have always been traditionally horror stories)
>Sprite work clearly demonstrates this philosohpy, with spikes, claws, protusions going everywhere and all gen 1 mons being unrelatable to humans
>Gained massive popularity thanks to its mature, disgust inducing and dark artstyle, instead of the usual cute, round and appealing design.