Syn Shenron

Syn Shenron (一星龍, Ī Shinron; lit. "One-Star Dragon") is the seventh and last of the evil Shadow Dragons to appear, and the last villain to appear in Dragon Ball GT. He transforms into Omega Shenron after swallowing all seven of the Dragon Balls (this is his special power, rather than having power over elements).

Dragon Ball GT
Shadow Dragons Saga-1,000,000,000,000,000

Shadow Dragons Saga-50,000,000,000,000,000 (Omega)