Devil Gundam
Highlight any robot, then hold [L] + [R]
+ [Select] + [Start] and press [A] at the character
selection screen.
Burning Gundam
On the second battle with Master Gundam, lose four
times to receive the Burning Gundam.
God Gundam in story mode
Lose the second battle against Master Gundam with the
Shining Gundam and continue. The Shining Gundam should be replaced
by the God Gundam.
Note: If you cannot wait to get God Gundam, die a few times on
any battle until you get the God Gundam.