From the main menu go to cheat codes and enter the following cheats for the desired effect. Directions refer to moving the D-Pad.
|Down, Up, Right, Right, Left, Up||Golden Megatron|
|Up, Down, Left, Left, Right, Down||Golden Optimus Prime|
|B, A, B, (RB), Y, (RB)||Unlocks Generation 1 Starscream|