At the main menu, go to the Extras selection. It will tell you to load a file (in this case yours). Then it will say Art Gallery, Dragon Challenges, and Credits. Select Dragon Challenges and beat all 5 challenges. You have to go in order 1-5. When you beat it will say, "You have unlocked Dark Spyro!" To use him, click left analog stick and you'll be Dark Spyro. You have to be in your file to use it.
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