Gundam: Journey To Jaburo Codes -

In-game reset:)
At the map screen press and hold, + + + + + .
 

Alternate suits:)
Choose tactics battle mode. Hold + + , + + , or + + at the mobile suit selection screen.

Press and hold + + at the mobile suit selection screen in tactics battle mode with Gundam to get its Realtype form.
 

To access the three types of colors for Gundam in tactics battle mode, press (blue Gundam) or + + (gray, red and white Gundam]. You can change the colors in the Gallery:) MS.