Anime Exploding Dragon Fist?

[Shadow Night]

Ive just watched the film called "Exploding Dragonfist" or something like that. And in it Goku (SS3) uses a move called the 'Exploding Dragonfist' to destroy the demon. Ive not seen DBGT or any further than the Buu saga but I was wondering where Goku learnt this move and if he ever uses it again. It seems to me to be the most powerful move in the entire show (from what ive seen) , the dragon completely engulfs the opponent and then just destroys it! Even Gotenks at SS3 couldnt compare to the demon so Im guessing Goku isnt that more powerful. So the move destroyed a being of far more power than Goku and unlike the Spirit Bomb or Kamey Hame it didnt need charging at all he simply said "Exploding Dragonfist". Also Gotenks was punched by the demon and became un-fused! I didnt realise that this could happen surely this is a massive disadvantage in a fight, if they are hit strongly enough they just un-fuse. This is relevant to my other topic also because if a fused being can become unfused (such as Gogeta) then that would mean the Vegetto fusion is far better! (Sorry if this seems a stupid post to any hard core DBZ fans but im really curious about this :) )

[SS Vegeta]

I believe you are talking about movie 13. The "demon" you are reffering to is Hildegarn. But as to how he learned the attack, I have no clue. He probably just learned it while he was dead, with the kai's. Yes that movie was indeed awesome. But it didn't have any subs. But life goes on...............sometimes.

[Nekkyo]

i believe the attack your talking about is called Ryu-ken. i think he used it to defeat the evil dragons that came out of the individual dragonballs. and prolly hildegarn for that matter. but i cant get to the website that i need to find this out. so i may be wrong
btw, its spell Kamehameha.

[Guest Altron Gundam]

The Ryu-Ken(Dragonfist) is a powerful move as Gokou uses it vs. Hildegarn, Evil Shenron(last one), and Super Jinzoningen Junangou, but it is far less powerful than the 10x Kamehameha, Chou Kamehameha, or the Genki Dama for that matter.