Mechanized Assault is the supermove of Green Lantern. Once you have filled your super meter to 4 bars, press
+
to perform the move. To earn this trophy, you must finish off Atrocitus with the aforementioned move.
On either Versus or Very Easy Single Fight, pick Green Lantern as your character then Atrocitus as your opponent. Chip down his health until it is around 25% or lower, then with a full super meter (perform special moves to fill it faster) press
+
to finish him off.