Nope, as long as the pokemon is hacked to be exactly like a normal one, it can go on PBR wifi. If you have more than 510 EV's or an illegal moveset on a pokemon, it won't be allowed on wifi. Also, you have to get the information from where and is caught and other such stuff correct as well.
So, make sure it's Pal Parked from R/S. I don't think the secret ID mattered for this one, but I know I made it 00010 for my Celebis. If you use your own secret ID and it fails, let me know.
Don't give it any ribbons, and don't make it shiny. It will be denied.
I've gotten Celebi and Darkrai onto wifi successfully too, so if you want their specs, I can dig them up, though Darkrai pisses a lot of people off and you won't score many friend passes.