Diablon

Diablon is a G.U.N robot. And is a boss in the game Shadow the Hedgehog.

If Shadow chooses the bad side then this would happen to the story:

Shadow is going to destroy Diablon, but then Sonic comes and protects it. Shadow gets upset on why did Sonic get in his way. Shadow then tells Sonic that he will handle both Sonic and Diablon. And whoever wins gets the Last Chaos Emerald. In the end Diablon is destroyed.