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As much as I want it to be Mightyena, I'm starting to have doubts because of how obvious this one it.
Khu's riddles are so convoluted and nonsensical they are sometimes impossible to solve until whatever he's referencing releases.
Like the rope with a knot in the middle hinting at Flamigo.
This one's answer is way too obvious that its Mightyena. Only evolved form that isn't restricted to nighttime. And Poochyena was in the trailer, used by Carmine.
It's too obvious to be the actual answer to the riddle.
It could be referring to like Absol or some other completely different 'mon. Like Carnivine for all we know.