No MasterRoshi didn't teach it to him, Ithink that he sort of instinctly knew it to a degree he just needed the right guidence to bring it out such as the words

maybe since he was born sayin it takes him shorter time to learn things such as attacks, and Master Roshi did demonstrate it for him when he had to put out the fire atop of The Ox King's palace, he saw it and mimiced it

mimicing is a form of learning though, and had Goku not seen it, he wouldnt have learned it:laugh:
Ques/
What is the name of the beast that is summoned from the regular dragonballs?

well I guess that you are right though about him in a sence learning it, sorry

A:it is paragus, i know that for a fact!

Q: who did goku fight in the final of the 23rd world tournament

I am not sure, but it was either "Jackie Chun"aka roshi, or Piccolo. I am not sure which one was the 23rd.

And Shenlong was right SSSnake.

Q/ What is the name of Babidee's father?

The 23rd Budoukai begins. After Chi-chi and Goku fight, they become engaged. Goku beats Piccolo and earns his first win at a Tenkaichi Bodoukai. The planning for Chi-chi's and Goku's wedding begins, but it is interrupted by the eruption of a fire in which Ox King is trapped inside Chi-chi's wedding room along with her dress. Chi-chi and Goku search for the Bashoo Sen to put out these magic flames.

so it was Piccolo

and the answer to Trunks's question it was Bibidi

now mine. Who defeats Garlic? Garlic Jr?

Im not too sure about Garlic, but i think it was Kame.

Garlic Jr. was banquished to the dead zone by Gohan after he held the red sheild technique.

Name The three oponents that were summoned by Babidee to fight on the spaceship (level1, 2, 3). Bonus points who fought who.

1. Pui Pui
2. Yakan
3. Dabura

What was the reason that Goku gave that he could see Yakan in the dark? 2 reasons

He could sense the disturbances in the air, and plus
he could smell him too.

What is Gokus saiyan name? (Very easy)

good

Where did Piccolo come from?

the original Daimo Piccolo came from Namek. But the Piccolo that we see now is the regurgitation in a last ditch effort of Diamo Piccolo to preserve himself. Is that what you wanted?

it works, your turn now

Where did Android 20 come from?

isn't Android 20 DR. Gero himself?

Exactly! Dr. Gero needed to stay alive longer to complete work on cell and transformed himself into an android your turn.

PS. I have to eat right now, so i will be back later.

yeah me too, later