Intentionally allow one of your members to die at the final battle. For example, if you allow Kulilin to die (as in the story) Goku will get angry. He will flash, then turn into a Super Saiyan (BP: 4999999). If you give him a BP increase-card, Saityouruu worth 30 pt, his BP will reach 7999999). Goku cannot use his kaoken attack.
Note: Do not allow Vegeta to die, you will fight him after you defeated. Freeza may also become Super.
Easy level-up for Gohan:
There will be a place in the first cave on the alien planet where a big ball rolls towards you. Allow it to hit your character; you will not die. If you have 6 HP, fight monsters and let them hit Gohan for at least 1 HP and do not die. If you have 5 or less HP, use a HP MAX card to get a level-up. Note: Your BP, HP and KI will increase but not your Exp. level.
This also may be done with Dende, Goku, and Vegeta. You can use it any time when they are under 10. Use a kami card or something that heals completely.
