I think this is foolish one but those who don't know how to Ascend thier super Saiyan lvls for them it's a good one.
First you need to hold the dowm button and the circle simple.
Not working then down traingle or down sqaure etc...
I forgot which key to press with the down arrow key
So Maybe I hlped..
Hope I hlped beginniers

I don't know if this will help you, but it worked for me.
When fighting kid buu in the last level try to get as far away as possible. Make sure the person you're using has a lot of health and has strong energy blast attacks. It could also help to have a lot of ki energy cards. Anyway when fighting, keep pressing circle to do the energy blast attacks. If you press R2 and then o, the attack will be stronger and you won't have to charge up the attack first. Make sure you charge up your ki every once in a while and keep doing this. Also if kid buu deflects your attacks or launches any attacks of his own just guard against them. This really helps when your energy is low. This saved me a lot of trouble. Hope I helped.
(ps: I used super saiyan 3 goku, the first time. After getting the second ending it helps to use super vegito.)

Ending A: Unlocked Majin Vegeta and Super Saiyan 4 Goku.

Ending B: Play as All characters in Another Road Mode.

Tip: Get at least Ending B and use Kid Buu in the Last level, give him alot of health and smash cards, when you fight knock the enemy down then press back and circle and keep doing back and circle and charge your ki when needed. If you do it right you will never lose any battles in the last level and you will get the Ending A.

To get Super Saiyan 4 Goku you need to beat the last level of the game.You have to fight Kid Buu 4 or 5 times.He has alot of health.I beat him with Gogeta with alot of HIGH stat raisers.But the battle with was still pretty hard.So be careful!

Ok, first you need alot of power cards or money,if it's money then go to the booster shop an buy the card you want.Now thats out of the way, set those.Oh and do not forget to buy an Ultimate Booster(This can really help with 1 stat,and more).Ok now go fight sometimes this works and sometimes it doesnt.It just depends on what cards you set,but you really might want alot high stat raisers for the last fight against Kid Buu,Broly,Janemba,and some others,I forgot who all.(I think one other was Dabura).Good Luck!

You can still complete the game and have all the characters because you can do story mode again and change the nickname so your m8ts will never no y you got ss4 goku easily give it a go but make sure you have the corret save file for you game i.e a eur save file for the european game or usa for the other

Back in the chapter where you must geet to the time machine let dabura destroy western city and then beat the mission a new route with an exceedinly annooying mission will be unlocked how ever goku S.S.4 will be unlocked as a character. Ith strength and movement speed both- Z!!!!