Finish ALL Chapter 6 in Another Road!
To start in Super Saiyan form when you immediately start a battle, hold R when choosing your character and press X, and you'll hear a "cling" sound, different from normally choosing your character with no R held down. Remember, for this to work, you have to hold down R and press X on the Super Saiyan form when choosing, not the normal one.
At first when you battle strong foe like Broly/ cooler final form /Super Buu/ and all the other hard character's, i found that if you Do a hook(R1 Arrow button facing the foe,When your next to him press Triangle) every time the foe is blocking or rising his KI you can easily brake his defence and rush him from then on. After than when his on the floor Raise your KI.
KEEP REPEATING THESE STEPS!!!! and u have Victory.
Bardock Defeat him as Goku in Chapter 5
Dabura To unlock Dabura, beat him in the second level in chapter 2.
Future Gohan Finish Chapter 5
Goku (SSJ4) Get Ending B (Can be obtained by letting enemies destroy 1-3 cities in the last chapter)
Picolo (Fuse with Kami) Beat him at the alternate path of Chapter 3.
Super Buu with Gohan absorbed Finish the third level of Chapter 7
Super Buu with Gotenks absorbed Finish the second level of Chapter 7
Vegeta (Majin) Get Ending A (Can be obtained by not letting enemies destroy any city in the last chapter)
Beat "Another Road" once or clear the arcade mode. Bonus will then be available in option.