>>27409430Basically, it's a thousand year curse on your ass if you grab one without asking it permission (and sometimes it does so anyways even after it gives you permission, just to be cheeky).
Considering the nature of things, that pretty much likely means you end up the Ninetales' own pet and left stuck living for a thousand years as it does whatever it desires with you and your body until it ends. And considering ninetales are some of the (hypothetically) smartest, sneakiest and illusion-skilled mons in the series....well, have fun with that, lads.