S.S.4 Vegeta /S.S.4 Gogeta:
Use Vegeta's Dragon Universe for AT LEAST the second time. Fullfill the "Broly Requirments", DO NOT go to the battle with Broly after the second battle with Super Buu. Slowly fly over the islands in the bottom-right of the map.When you fly over the right one, a scene will automatically triggered. After the scene has ended, go beat Broly. After Broly has been beaten, ignore the red dot and go to Baba's Palace instead. Carefully search surrounding area for a spot labeled "Plains". After you talk to Bulma, go to West City. After the West City scene, you will have the S.S.4 capsule for Vegeta (it also explains how he skipped S.S.3). Now go to the island with the red dot. If you defeat S.S.4 Goku, you will unlock the S.S.4 Gogeta capsule for Vegeta.
In order to get SS4 Goku, you need to unlock Broly (or buy the capsule from the shop).....
Broly:
This guy is a pain...but he's still fun to use...as usual, you need to use Goku's Dragon Universe for AT LEAST the second time. Now, get to the Majin Saga,...the point where Goku is looking for a person to fuse with. After Gohan is absorbed, look in the surrounding area (where Goku starts this stage), for a ??? nearby. After the scene with Hercule, head towards the red dot, BUT DO NOT START THE BATTLE WITH SUPER BUU!!!!! Close to the dot, will be another ???. After the scene with Tien, search the surrounding area once more,...this time for a spot labeled "Mountains". After you talk to Kibitoshin, go and fight Super Buu. After Super Buu has been beaten for the second time (the fight within his body), a new red dot will be on the map. BEFORE you go to this new battle, search the islands to the East/right of the World Martial Arts Tournament. If you find the correct one, you will unlock the S.S.4 capsule for Goku. Now go to the red dot. If you beat Broly, he will become unlocked. You can battle Broly with Vegeta, but the sequence is slightly Different. BEFORE you fuse with Goku, go to "Ice Island". After talking to Kibitoshin, go fight Buu. The "Broly Dot" will appear later
Death is but a door, Time is just a window,...I'll be Back!!!!!