Rotom code help

[Piek]

Can sombody give me the AR code that lets you use the alternate forms of Rotom/Shaymin/Giratina on wifi for the european version of HeartGold.
I've found several codes but none of them worked, does sombody have a working one, I know it's possible.
Also, is there a different code for Platinum and HG/SS? Or do they all use the same code?

Thanks in advance