Super Robot Taisen: Scramble Commander

Get Dancougar's and Raideen's Shooting skill to +4 or greater.

Successfully complete story mode under the hard difficulty setting.

Play the game in story mode. In Chapter 7, have Gundam Ez8 fight against Gufu Custom, then in Chapter 13, have Gundam Ez8 fight against Apsalus. Gufu Custom will be available in Chapter 14.

Successfully complete the game in story mode and save it. Load the saved game file, then watch the ending again. Select trial mode, and all characters unlocked in your save will be available for selection.