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Uploaded on Apr 5, 2010
Thanks to Tina on Bulbapedia for discovering this on accident.
With an Arceus met at the Hall of Origin (haven't tested elsewhere in Sinnoh yet, but hey, I'm but one man) you can go back to the legendary Sinjoh Ruins after your first trip there, and obtain a second member of the dragon trio.
No idea if you can go back a third time yet. Just watch the video, and hear my unwarped, echy voice, and see my terrible camerawork recording a DS screen.