I found out a really nice combo with Gogeta Super Sayian 4. Either get to MAX POWER! Mode, or use Power Up to The Very Limit, then do a Dragon Rush (Hold Z, and swing the Nunchuck forward) at the enemy. Hold B, and You'll kick the enemy hard. Press A really fast after kicking them, and you'll start to attack super fast, dealing loads of damage. When your MAX POWER! Is almost out, stop tapping A, and quickly press B, then hold Z and B together.(This takes some practice.) You'll kick the enemy away, and then charge a Big Bang Kamehameha right away! As the enemy starts getting up, you'll be done charging, and Wham!
Go to the last saga(the one of syn shenron) in level 1(because is easier) in every battle destroy all the buildings until you found it,to make it easier buy the dragon radar and when the battle starts press -, it will show dragon balls in the radar, when you summon shenron if in the options is not the one you want pause the game and put Select Scenario and summon him again.
After you beat the game go back to senarios and go to the android saga start at the cell games begin. than with hurcule go to the mountain road and talk to yamcha he will make you an offer if you can beat him for one million zeni his at level 220 or something seems impossible don't it WRONG right before the fight starts quickly fly back and go under water as far back as possible than just wait most of the time he wont find you wait till the time runs out than you got an easy 1 millon zeni can repeat as many times as you whant just go to select senario
On the map screen in Dragon Adventure go to the wasteland place and figt the tree saibaman there when you win you will get an item called saibamen set now go to the item shop and sell it for 150,000 zenie. ( Note you can do this as much as you want but you can't after the android saga.)
Quite by accident my friend and I discovered that most characters in max power mode can spam melle attack without hitting the opponent away like what usually happens. There are some exceptions such as max power mode freiza.
When you are Goku, before you fight Vegeta (scouter) for the first time, go to the dot on the map that is not Baba's store. Fight the Saibamen and you will get the Saibamen Set. Now go to Baba and sell it. You can do this as many times as you want and it is worth 150,000 zenie each.