The Red Chain is an object that appears in the Pokemon series of video games. It was created by Team Galactic leader Cyrus in his plot to capture the deity pokemon Dialga and/or Palkia. It is created from gems produced by the Pokemon of the Lakes, Mesprit, Azelf, and Uxie.
The Red Chain is based off of an old Chinese myth about the nature of the solar eclipse. They believed that a solar eclipse occurred when a deity dragon tried to swallow the sun. They would take a red cord, and wrap it around a statue of the deity to restrain it.