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Go in the World Tournament during the (Saiyan saga) and talk to the "Poll" guy and say "good idea".
Find all the Dragon Balls to unlock the time machine.
Go in Capsule Corp and use the Time Machine and go in Garlic JR saga.
Play with Chi-Chi, go inside Chi-Chi's house and watch TV.
Talk to Master Roshi
Meet Master Roshi at Kame House and choose the option " Quest ⇒ Tournament.
Accept Master Roshi's deal (Chi-Chi must have at least 6 naughty points).