Deino before the E4

Deino before the E4 - Man in Black Shorts and Red Nike Shoes Sitting on Floor

Is there a way to get a deino(Hygreigon) before defeating the Elite 4? I've looked it up but there are mixed answers.

Thanks in advance.

pokemon-black-2-white-2

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Images: Bruno Bueno, Nurlan Tortbayev, RODNAE Productions, Ron Lach