Fusion with goku and vegeta

Answer from: Kid Gohan 19
Unlock Gogeta and Vegito. Use Goku and Vegeta in battles and when Union Stock is at four use fusion or Potara fusion (learn how in training>battle guides). Your player can't be transformed and this works best in multiplayer. If it's in multiplayer your partner has to accept the request by pressing SELECT.

Answer from: dany
Play battles with goku and vegeta for vegeto and gogeta

Answer from: Super 17
Play battles and make Union Stock at 4 and then you will do fusion or Potara fusion if multiplayer, only accept by pressing SELECT you would fuse into Gogeta, Vogeta, or Kakorat

Answer from: bom bom
To do potra fusion unlock vegito by playing dragon walker. After you did this, while playing in free battle take vegeta and goku and while doing the battle keep doing the normal fight untill the union stock is 4. Then pull the analog stick upwards and press select you will do potra fusion and for gogeta same procedure until the last one in which you should not pull the analog stick up, only pressing select will do the job.note;the fusion will run out when you do normal fusion to become gogeta.