When Pokèmon Platinum was announced, lots of scans and screens came out on the net and Nintendo also put online a website about the game, with a screen of the battle vs. Giratina Origin. Howerer, the Giratina Origin sprite that we see in this screen is not the same one as the final version.
Also, there was a beta sprite of Shaymin Sky form that was dropped before the release. There are also some beta items in Platinum that are also in D/P:
They have no function in the game but they can be found by hacking the game or cheating.
(Source : Bulbapedia)
Another thing just discovered : Pokèmon Platinum has a test music that’s just a remix of the Pokèmon R/S/E opening. Howerer, the music is unused in the game.
Update: most of the Pokemon Gold and Silver references could be used in the new G/S remakes, since it’s intended to be compatible with Diamond, Pearl, and Platinum.
U64 is an archive with articles, screens and videos for cancelled, beta & unseen videogames. Every change & cut creates a different gaming experience: we would like to save some documents about this evolution for curiosity, historic and artistic preservation.