Calling it now, It's a Dark/Flying Pokemon. I looked up meaning "Koko" bring ups name sites about it meaning Stork and Night in Japanese and Native American, respectively. Not too sure about it being Stork, but the claws in the silhouette make it a compelling argument.
FYI, adjusting the exposure and contrast of the silhouette reveal some lighter makings on the Pokemon above the wrappings and on its head, similar to the boy. It's a pretty odd tan for a human
Last time people speculated certain humans and Pokemon (Ultra Beasts) were the same, it ended in a spectacularly funny fashion.
Besides, I bet the imagery of capturing a feral human and using it in combat wouldn't go over well.