First, make sure the dot is in front of the square, not inside it. Then u just face the dot thingy and press A. Ta-da! u found something!
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In HG/SS you can find one in route 20, using the dowsing machine. It can also be attached to Relicanth and Lanturn. In D/P/P I do not know
Nope, you can only place items in your bank using one button.
You teach it surf by using the Hidden Machine.
By downloading the yellow forest WiFi gift that is out right now, walking around for about five to ten thousand steps (depending on the type of Pokemon you brought along), then using the dowsing machine to find items in the grass, which might be a light ball.
Have you tried using the vertobrains