Dude just because it's ID is 00000 doesn't mean it's impossible. If a hack check says it's legit i don't see why you need to question it. If you don't want it like I said you can pick something else from my shop.
My partner and I asked RNC to hack check the Suicune for us and she says the Suicune looks legit and I should be allowed to redistribute so it's up to you to keep it or not.
Yes, it does seem quite strange thank you for pointing it out to me. :] I'll have a talk with who I received it from and in the mean time you can choose a different pokemon out of my thread if you'd like or you could get your own pokemon back.