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Milotic won't get a fucking mega. Neither will Flygon. Why?
Because Milotic is Wallace's signature Pokemon, and Flygon is Aarune's. If M-Milotic was in the game, what better way to introduce it than to get Wallace to use it against you? But they won't fucking do that and you know it, because Jap game producers are way too fucking bent on pushing the "special snowflake" concept.
Also, look at Aarune's official artwork. Do you see a megastone?