Later on, the matches continued. And eventually it came down to Goku versus Piccolo. However, there was a key difference within Goku, and his friends, it was small but it made all the difference. Their state of mind was more focused and serious. They understood the stakes of the fight, and they had someone they couldn't let down driving their determination. And it was this difference that turned the final match into a fight Goku had a hard time winning, but not so much that the island disappeared.
After the battle was over, the area around the tournament had been severely damaged. But Goku had done it, he finally won the tournament, proving he was indeed number one under the heavens. Piccolo laid there beaten and broken while Goku was exhausted and injured, yet still standing.
"Goku, kill him. After you can wish me back with the Dragon Balls." Kami said, rushing Goku.
"What are you waiting around for, Goku? An invitation? That's the guy responsible for killing Krillin, Chiaotzu, and so many innocent people." Master Roshi added, as Goku just waited and thought about it.
"Kami, you're not a very good liar are you?" Goku said, eating a senzu bean, and prepping another one.
"What do you mean by that Goku?"
"Kami, you're the one who made the Dragon Balls, wouldn't they lose their power without their source?" Goku asked.
"Huh? Hmm, I never thought about it like that. It's plausible."
"And that's a risk I'm not taking. I can handle Piccolo…"
Bulma spoke up now. "Why don't you fuse together again, Kami?"
"Well, Piccolo is stronger than I am now. I'm afraid I'd be the one taken over."
"Then there's no other choice. I'll handle Piccolo if he ever tries anything again."
"If you're certain… But you must keep up with your training. I will continue to train as well, you should all do so as well."
Goku then gave Piccolo the senzu bean, recovering from the epic fight just had.
"Damn it, what's with you? You're even stronger now than you were before." Piccolo grumbled, annoyed by the prospect.
"I don't know what it is, but whenever I fight, I grow stronger and I heal back even stronger still." Goku said, offering his hand to help Piccolo up. "But you know, you're the toughest opponent I've had yet."
"Oh yeah? Watch it, I won't lose next time we fight." Piccolo said, getting up on his own. "And don't expect me to be friends with you."
"Heh heh, that's fine. You can go at your own pace Piccolo. Let's have a rematch in say a year?"
"I may kill you next time. There won't be any rules holding me back either."
"Heh, that's if you get strong enough to kill me."
Piccolo grumbled and then flew off to inhabit some wasteland to train in. That bastard, I'll definitely get back at him for this defeat.
"Well, now that the battle is over. I guess we should reveal what it was we agreed on, Bulma."
"Oh yeah, what was it?"
"I'm going to provide them a place to live at capsule corp. And they will be Bosa's godparents." Bulma said, with a difficult smile. "I'd have liked more. But, with Goku there, I'm sure Bosa will grow up to be strong and kind. And with them both there, Bosa will soon have a friend closer to his age." She explained. "While I'd like to have Goku all to myself, My son comes first and he needs a father. This is the closest he'll get. You'll do that for me, won't you, Goku?"
"Oh, me pal around this little guy?" Goku chuckled while picking Bosa up. "Of course I can! I'll teach him everything I know about martial arts too. He'll be strong enough to protect his mother."
"And, I'll help take care of him while you work Bulma."
"Hey Chichi, we can even train together. Bulma was thinking of making some kind of machine that'd help us out a ton. And with everyone else visiting, we can have fun sparring together. It'll be so much fun!"
"Goku… I… I want a baby…" Chichi replied, ignoring the content of Goku's words.
"Huh? Uh sure? But uh… How does that happen? Don't you just ask the sky and a bird brings the baby?"
"Pfft, Goku… You're really an adorable idiot." Bulma laughed, watching Goku and Bosa interacting so naturally. "It'll take a while to make that machine so you and Chichi can focus on doing that. But first we have to hold your wedding and throw a giant party. There's going to be a lot of food there."
"Food? Now you're speaking my language!"
So the friends left and threw a lavish and expensive wedding party with enough food to feed a small army. It was then that Goku and Chichi left for their honeymoon on Mt. Paozu. Three weeks later, they returned to Capsule Corp to see Bulma and her father working hard on building a chamber-like room with a bunch of bells and whistles.
"Oh wow, this looks great, Bulma!"
"Thanks, Chichi… Hmm, it looks like you held up your end of the deal so far."
"Yep, I tested positive. Where's young Bosa, I want to see how he's doing. I hope he didn't forget about me."
"He's getting attention from his grandmother right now."
While they were talking Goku was just looking around the room, he didn't understand it at all, but he could tell it was going to be sweet.
"Bulma, who's the couple?"
"Dad, that's Chichi and Goku. They're the ones that we threw the wedding party for…"
"Oh my, that's right. I really should lay off the books a little. So then, you're Goku. I heard you were excited. The room should be ready for up to 20 times our earth's gravity, in about… Oh I'd say… hmm, how long do you think, Bulma?"
"If you keep yapping like that, it'll take decades!" Bulma fired back, noticing that her father had stopped working. "If everything goes smoothly, the first test will be ready in a week. But that will only be 5 times. Once we collect data on that, and work out the rest of the kinks, 20 times should be possible in an additional month."
"Oh, that gives me a week to play with Bosa before the others get here. Sweet, I wonder what we'll play?" Goku said, with his typical upbeat attitude. "Oh, and thanks Bulma. I really can't say how much this means."
"I get it, now go play with Bosa, he's missed you." Bulma said waving, hiding her wide smile as she went into overdrive.