|This event exists primarily or exclusively within the Sonic X continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Operation Duplicate was started by the Metarex and involved the production of artificial Chaos Emeralds as a part of the Metarex' plans for their universe-encompassing forestation project. Using real Chaos Emeralds, the Metarex were able to make hundreds of replicas with nearly identical powers and divide them between their forces. The process was flawed, however, as the Emeralds produced were frail and would eventually burn out.
While looking for a Chaos Emerald, Tails and Cosmo discovered an Emerald factory on a distant planet and stole both information on Operation Duplicate and the real Chaos Emerald. Sonic later came across a bunch of fake Emeralds which briefly turned him into Dark Sonic.