Well, spoilers anyone. Don't read the next paragraph if you are gonna watch G G Gundam.
The Devil Gundam uses people to power itself. The person it was using at the end was the hero's love and he told her "I love you" so she escaped the DG's grasp and it loses a lot of its power with no one as its power unit.
-Spoilers done.
And, I am a Gundam fan, too. That's why I like the innovation and plot depth in this anime. I also loathe Gundam Wing for every reason on this site multiplied by 50.
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