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Inkay's early pokédex entries make it seem like a scavenger, using its hypno-lights primarily to escape predators. But in the Alola dex, after its inclusion in Ultra S/M, it's described using them to carnivorize its own prey.
What if after Inkay was introduced to the new habitat of Alola where carnivory is more common, the species experienced a physiological adaptation to switch from foraging to active hunting?