Metal emerald

Metal Sonic's Chaos Emerald

Metal Sonic can power himself on Chaos Emeralds, or use them to make him stronger

In Sonic Rivals 2 he uses a Chaos Emerald (that he stores inside himself) as a power source and a way to hide it from enemies.

He can also use all 7 of them to transform into Super Metal Sonic or Metallix depending on which universe.

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