To get Bardock, Babidi's Pot and a Silver Membership Card have a saved game from Dragon Ball Z: Budokai 2 on your memory card.
When choosing a character at the selection screen press Left.
Additional difficulty settings:
To unlock difficulty 'Z'successfully complete Dragon Universe mode on Very Hard difficulty.
To unlock difficulty 'Z2' successfully complete Dragon Universe mode on difficulty 'Z'.
To unlock difficulty 'Z3' successfully complete Dragon Universe mode on difficulty 'Z2'.
To unlock a Trophy successfully complete Dragon Universe mode on difficulty 'Z3'.
Unlock Dragon Arena:
To unlock Dragon Arena successfully complete Dragon Universe mode with all eleven characters: Piccolo, Vegeta, Kid Gohan, Teen Gohan, Gohan, Goku, Broly, Uub, Yamcha, Krillin, Tien.
Finding Dragon Balls:
The following is a list of how to find the Dragon Balls in Dragon Universe.
Two Dragon Balls are in Saiyan Saga (Earth)
The first ball is by the white plains; around Red Ribbon Army Base.
The second ball is between the upper two main Islands.
Two Dragon Balls are in Frieza Saga (Namek)
The third ball is at the upper right island.
The fourth ball is on the left Island near map border, southwest of the upper left Island.
One Dragon Ball is in Cell Games (Earth)
The fifth ball is found where the compass is on the map in the water.
Two Dragon Ball are in Buu Saga (Earth)
The sixth ball is by the main Island towards the middle by North City.
The seventh ball is at a little sandbar Island (looks like a beach) near the Martial Arts tournament.
In Kid Gohan's story mode, there are four Dragonballs on Earth and three Dragonballs on planet Namek. Some Dragonballs may be in the water.
Omega Shenron: Easy money:
Go to the tournament, and when it starts, fly to the edge of the ring. Equip Concentration. When your opponent attacks, teleport behind them and attack them. Sometimes this causes a "warp battle" but if you have enough ki you should win.
(supplied by: Final_Destiny)
To get Broly you at least have to have beaten Goku's DU once. After Buu absorbs Gohan go to ??? near where Gohan was absorbed then talk to Hercule. Then go near the red dot but Do NOT GO THERE! Find MOUNTAINS then talk to Supreme Kai he then says "I sense a power stronger than Buu". Then go to the red dot after you beat Buu. Inside go to the dot and Vegeta says "I will take care of Buu" you then find ??? (which is your next destination). Beat him and youll get Broly.
(supplied by: Iceman)