First, set the fast clock as a bonus setting.  Select Vegeta in a tournament fight.  When
time is nearly up, start using Vegeta's Oazaru attack.  If you are using the attack when
time runs out, for the rest of the match (Round 2 & 3) there will be a moon moving slowly
around the screen. Note: It is pretty hard to get exactly the right timing.

The easier way to knock out your opponent is to simply duck and kick/press are. You might
get hurt though but you will be a 'quick winner'. But for doing this you must get closer
to your opponent.

Succesfully complete the Time Challenge as Gohan.

Hover Punch- 

Left, Left/Down, Down, Right/Down, Right, B.

Green Sphere-

Down, Right/Down, Right, Right/Down, Down, Left/Down, Left, R.

Seismic Punch-

Down, Left/Down, Left, Left/Down, Down, Right/Down, Right, L.

Succesfully complete tournament mode as Gohan.

Succesfully complete tournament made with all characters including the hidden ones.