How does everyone pass this part in Diamond?

In pokemon diamond there is this part where you go underground and you have to dig up treasure or something..there is this part where you get trapped in leaf and you have to blow them away..how am I suppose to do that when you can't blow on the screen?

You must blow on the microphone to do that because without micro.. there is nothing you can do

Thats a good question. O_O

For me, it's working fine.