How do you get the members pass in pokemon diamond so that you can catch darkrie?

How do you get the members pass in pokemon diamond so that you can catch darkrie?|||oh u have to action replay or go to a nindendo event OR if u want to get darkrai get the walkthrough cheat then go to fullmoon island and walk east on the water till u see newmoon island.go inside the cave AND DARKRAI!|||Event or Action Replay|||Nintendo event