Allow one of your weaker characters to die in the final battle against Frieza (Chaozu, Krillin, Yamcha, or Tien). Goku will become enraged transforming him to a super saiyan! His BP will now be 4,999,999! If you give him a sachioro card ,his BP will be 7,999,998! He is now a lot more powerful than Frieza.
Fight Super Saiyan Vegeta
Allow one of your weaker characters to die in the final battle against Frieza (Chaozu, Krillin, Yamcha, or Tien). Goku will become enraged transforming him to a super saiyan! His BP will now be 4,999,999! If you give him a sachioro card ,his BP will be 7,999,998! He is now a lot more powerful than Frieza! After you kill Frieza wait for the credits to finish to battle Super Saiyan Vegeta.
Play as Captain Ginyu
You will need a few healing cards for this. During the battle with Ginyu in Goku's body, take out Jeice or Burter (which ever one you didn't kill) so that Ginyu is your only target. Try to get Ginyu weakned enough to do his body switch attack. If Ginyu successfully switches with one of your Z fighters, switch that warrior with the order command with another warrior (The warrior Ginyu switched with will become Ginyu). Like everyone else I know, I used Tien. Keep the warrior Ginyu switched with out for the rest of the battle. If you use Ginyu in battle, he has a fireball attack and his body switch. He can body switch with anyone including Frieza and Super Saiyan Vegeta.
Saiyan Level-Up
When Goku, Vegeta, or Gohan reaches a health level below 5, use a card like Korin, Kami, or Shenron, that fully heals a character, on them, and they will grow one level. This can be recognized in the show when Vegeta tells Krillin to hurt him badly and then let Dende heal him so he can become stronger.
Scouter trick
Use a scouter before you fight Dodoria. After you beat him to a pulp, you train as Goku in the ship. You get the gravitrons HP, BP, and KI. When you're training with Piccolo on King Kai's planet you get the planets HP, BP, and KI. You also get Nappa's and Raditz's HP, BP, and KI.
Super Saiyajin Battle
When you are fighting Freeza in his fourth and final form, let a weak character like Kuririn or Chao-Zu. My preferred choice will be Chao-Zu. Do not let Son Goku, Vegita, Gohan and Piccolo die. After defeating Freeza in his final scene, the usual credits, showing Goku flying will be seen until Vegita appears. Vegita will then transform to Super Saiyjin Vegita and so will Goku transform to Super Saiyajin Goku. Thus, the ultimate battle among the super saiyajin begins. Super Saiyajin Vegita is by far the toughest boss in the entire game, even stronger than the final form of Freeza. Once you defeat Super Saiyjin Vegita, you get a new ending that is different from the normal.
Fight as Super Saiyan Goku...