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Game Freak really likes how moths can be neotenic, so much so that nearly every moth line forgoes the caterpillar->pupa->imago progression that butterflymons have, and either make::
>the final stage not mature into an adult moth (bagwormmons)
>the first stage resemble a neotenic adult like pic related, or already come adult-like (even Surskit can fit in this category despite Masquerain only loosely being based on moths)