You have to beat Lucas (Rival #2) At some point.
Chat with our AI personalities
its a poketch app.
that's how you find hidden items
dawn will also give you the dowsing machine
On Pokèmon Platinum, you get the Dowsing Machine after you beat the Sinnoh Pokèdex, when you talk to the Professor.
Yes she does. If you find it (use Dowsing Machine) she will give you a White Flute. Only in Platinum though.