First, you need to buy the Z difficulty in the black capsule section. Then, you need to have beaten Omega Shenron with Super Saiyan 4 Gogeta in the GT Saga. Then, continue doing Dragon Mission until you unlock new missions in the Majin Saga. One will have you play as Android 18 against Hercule. The missions is to let Hercule knock you out of bounds. Put the difficulty on Z and when the battle starts, rush into one of the outer corners of the arena. That way, when Hercule does a smash attack, it will knock you out of bounds. If you do it right, you will get a Z ranking and will receive 60,000 zeni. Also, if you manage to equip the WE GOTTA POWER!! Z item when it's maxed out at lvl. 5, then you can receive 120,000 zeni this way each time you do it. Note: try not to hurt Hercule or prolong the battle.
Added by: Goblinaro Nov 18th 2008, ID#31211