Pokémon Diamond, Pearl, and Platinum, created from crystals drawn from the Sinnoh's lake guardians. It is used by Cyrus to take control over the legendary Pokémon Dialga and Palkia so as not to reduce their power by capturing them in a Poké Ball, with the ultimate goal being to destroy the universe and make a new one without spirit.
In Platinum, Cyrus's computer details information on the Red Chain:
- The Pokémon of the lakes and Mt. Coronet are somehow connected. Capturing the Pokémon of the lakes will free the Pokémon of Mt. Coronet. From the Pokémon of the lakes, crystals can be extracted to create a Red Chain.
- Using that Red Chain, the mythical Pokémon can be summoned and shackled to do as we command...