We don't know the full formula for Hadou Regis. We also don't know the trash data. Therefore recreation is not a good idea.
As for Pokecheck, I have all of the not-obviously-hacked private uploads. It's not possible to determine a formula since I don't know which (if any) are legit.
As for known legits, I know of 2 Pokemon in 3rd gen format and they are with private collectors.