You just tap the middle an if it doesn't show a dot on it then there is no hidden item around that area
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On Pokèmon Platinum, you get the Dowsing Machine after you beat the Sinnoh Pokèdex, when you talk to the Professor.
its a poketch app.
dawn will also give you the dowsing machine
that's how you find hidden items
Yes she does. If you find it (use Dowsing Machine) she will give you a White Flute. Only in Platinum though.