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Thought you'd know the answer :)
Press the jump button twice (O, O) and then the smash button (x).
Simple as that.
You help him as your younger you can probably explain it better :P
Now, help the poor little fella.
Welcome to the forums - we've had this topic brought up before but there's not many people here who've played it.
If you goto www.gamefaqs.com and do a search on there you'll probably find your answer.
Enjoy your stay
:D