I've got one Arceus that is in a Cherish Ball and has a Japanese OT. Its name is also in Japanese.
Stats aren't abnormal, it is a Jolly nature, it says it came from Sinnoh and it has Dialga's Palkia's and Giratina's signature moves plus its own.
These are its stats (isnt EV trained):
My second Arceus is from the Dream World, caught with a Dream Ball, has a Brave Nature and is supposedly from the Unova Region . The only thing is, it doesn't have a classic ribbon like the Japanese one does. These are its stats after EV training it:
What would make these fake if anything?