Pokémon Platinum beta

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During the planning and development stages of Pokémon Platinum, several things were going to be a part of the games. Some of them were dropped or changed, but some of those dropped concepts of the beta version can still be found in the game's programming.

Shaymin's Sky Forme sprite

Before the game was released, there are pictures from Coro-Coro Magazine show a beta sprite for Shaymin's Sky Forme.

Beta items

Various items have been discovered by Serebii in the coding of Platinum that were also in Pokémon Diamond and Pearl. These items can be obtained using Action Replay and other cheating products, but cannot be used. They are:

S.S. Ticket, that allows entry for the luxury liner S.S. Anne (a possible reference to Red and Blue or FireRed and LeafGreen).
Contest Pass that would allow entry into Contests. However, Super Contests allow entry without a pass.
Magma Rock would be a mystical item that could be used in Stark Mountain. Although it hasn't any known purpose, it is possible it would have something to do with the Heatran event.
Red Chain is a creation by the lake trio that would be used to awaken Dialga or Palkia. Cyrus actually himself uses the item in-game, and it's possible that the Team Galactic event at Spear Pillar was initially to be activated by the player.
Rule Book was a book that would be used as a guide when using the Nintendo Wi-Fi Connection. It's possible that this was removed since these guidelines were contained in the games' instruction book.
Seal Bag held up to 10 Seals, but was replaced with the Seal Case.
Treasure Sack was meant to hold treasures from the Underground. Was replaced with special selections for the Underground.