Back Story...
As we all know, Gokou faced off against Vejita-Bebi and lost, even at Super Saiya-jin 3. Just before Vejita-Bebi fired his Death Revenge Ball at Gokou, Kaio-shin saved him but lost him in Shougo Space. There, Chibi Gokou was forced to play a board game in a life or death match as Vejita-Bebi wished for a new planet Plant from the Black Star Dragonballs. Gokou eventually escaped from Shougo Space with a couple Space Raccoon Dogs (who knows) and went to the planet Kaio-shin. There, he began training to beat Bebi. Bulma designed a spaceship for Vejita-Bebi and they took abut one hundred or so of Earth's inhabitants to the new planet. Pan, Mister Satan, and Buu snuck aboard the ship and hid upon landing. Gokou watched as Pan tried to give everyone laxatives to fix them (go figure), knowing she was going to get hurt. He was right, Pan was caught by Gohan and almost killed until Ubuu stepped in and challenged Vejita-Bebi. Gokou wanted the fast way back into the fight so the Kaio-shins began to try and pull his tail out (this was freakin hilarious!), the source of a Saiya-jin's power. Ubuu lost and was about to be killed when Buu stepped in and sacrificed it all. What was left of Buu fused with Ubuu and they became one once more. However, Ubuu accidentally turned himself into chocolate (which Vejita-Bebi ate) just before Gokou returned. With his tail back, Gokou tried again and got his butt kicked once more. However, he looked at Earth and it acted as a full moon, turning him into the Golden Oozaru. He went on a rampage until Pan helped him regain control over his mind with a picture of the entire gang at the beach. Gokou turned Super Saiya-jin 4 and kicked Vejita-Bebi's butt. However, Bulma created something to magnify the Earth's rays and Vejita-Bebi turned into a Golden Oozaru and kicked Gokou's butt(that's a butt-load of butt kicking). Kaio-shin got the Chou-si water and cleansed all those on earth of the evil seeds put into their minds by Bebi. Trunks, Goten, Gohan, and Pan gathered around Gokou and gave him their energy which he used to make a Kamehameha and drive Bebi out of Vejita's body. Bebi was killed as he escaped to space.
The earth exploded as it was supposed to because the wish was not made in time and Piccolo decided to go with it. Later however, they get the Namekian Dragon Balls and wish the Earth back, but Piccolo was still dead. Now, back to the dream/story...