How to shake a coconut tree in NDS version of the legend of zelda: Phantom Hourglass?

As far as I know, it seems impossible to perform the shaking action.

If you need to photograph something from the tree, the operation is a bit troublesome:

First aim at the tree, then draw a circle on the outermost edge of the screen in front of you with a stylus (or mouse), and Link will roll over and hit the tree. If you can't try, you can find an empty place and let Link run all the time, drawing circles while running, and you will feel it when he rolls over.

But if you mean the beginning, the bulletin board says that the coconut trees on the beach don't need to shake or bump, just count how many trees there are and write them on the board. I remember seven trees, but I can't remember them clearly.