Red Chain
The Red Chain is a special key item, in Pokémon Diamond, Pearl, and Platinum, created from the crystals of Sinnoh's legendary trio: Uxie, Mesprit and Azelf. It is used by Cyrus to control Dialga and Palkia, in order to complete his dream of creating a new world. He wants to use the chain instead of a Poké Ball so that their power won't decrease.
Description
A mythical chain that is said to link the legendary Pokémon that created the Sinnoh region.
It is said that the Red Chain summons Dialga and Palkia when it is put together.
Location
The item is, in fact, unobtainable in the games. This is because Cyrus uses the item himself in the story, and by the time Dialga and Palkia are summoned, the item has lost its purpose. The key item was created in the games' prototype and still remains in the games' coding. It can still be obtained by hacking into the games' coding with a hacking device, but it serves no real function. It can be assumed that the Dialga and Palkia event was going to be started by the player instead of Cyrus, or that it was created in order to beta test the game before Team Galactic was put into the game.
After the three Pokémon of the lake appear at the Spear Pillar to Dialga and Palkia, the Red Chain crumbles away and the dragons are no longer under the control of Cyrus.
