Why does the Mantine XY/SM/ORAS sprite not have the Remoraid?

Question

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he doesn't have it gen 4 or 5 either

Answer 1

The reason Mantine appears to not have Remoraid by its side is because, Mantyke is the one evolving into Mantine, not Remoraid. Remoraid evolves into Octillery by itself. Mantyke just needs a buddy, Remoraid, in order to evolve.