Omega Shenron: First: you must fullfill the "Broly Requirements" aAfter Broly has been defeated, ignore the red dot and go to West City. After the conversation with Bulma, go and beat Gotenks at the tournament (this will unlock the Gogeta Fusion for Goku). After your battle, a new red dot will appear...Omega Shenron. When you arrive, S.S.4 Vegeta will show up. The two of you will fuse to become, and unlock, S.S.4 Gogeta. If you beat Omega Shenron, he will become unlocked.
NOTE: You will be able to defeat Omega Shenron easily in the transformed state. If you run out of time, and change back into Goku, you are so F**ked!!! Try like hell to use the 100X Big Bang Kamehameha, it will put a serious A**-Whooping on him!!!
Death is but a door, Time is just a window,...I'll be Back!!!!!