>>52258183A related concept I’d like to see would be mimicry (of other Pokémon, as opposed to camouflaging as foliage or scenery)
(The difference between mimicry and convergent evolution, is convergence happens due to independently developing similar solutions/features to similar environments and niches, whereas mimicry is an adaptation to deliberately cause another organism to misidentify as another one.)
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The only pre-existing examples I can really think of off the top of my head is Mimyku. I’d count Caterpie if there was an actual snake mon that it resembled.