Ghost

In the far north of Hisui, there were rumors of a peculiar tribe of humans who all wore pokemon shaped masks. These masks are made once its been announced a new child would be born within the tribe and the pokemon the mask is based off of could symbolize a variety of things: an ursarang mask for the child to grow up with tremendous strength, a psyduck mask to say that they might suffer frequent migraines in the future, etc. its mostly all interpretation so not all masks perfectly reflect their owners.

Then one day a very peculiar child is born in the tribe, one with pale skin, hair as white as fallen snow, and pink eyes. Many took on the idea that the child was a sign of an omen, her rather ghostly appearance off-putting compared to the warm skin tones of her people, and decided to abandon it in the snow in nothing but a basket and the zoroark mask that was made long before her birth.

Most would assume she perished long ago, taken by the icy wastelands before even a hungry pokemon chanced upon the infant.

And well this woman with pale skin, white hair, and a hisuian zoroark mask would happen to agree with most, if not a bit coyly.