In Pokemon Black, the Dowsing Machine is automatic. When an item is in range, it will point in that direction.
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Go to your bag (by pressing the X button) and select Key Items and select the Dowsing Machine. The dowsing machine will tell you where to go by pointing out a direction.
The purpose of the dowsing machine is to find things. when you hear a beep, your close to a hidden item. when your on the dot, press A to find the hidden item.
In Pokemon Black and Pokemon White, you can find Rare Candies in Route 2, Route 13, Route 16, Nimbasa City, Mistralton Cave, Chargestone Cave, Anville Town, Victory Road, Abundant Shrine, Lostlorn Forest and N's Castle, with the Dowsing Machine in Route 3, Pinwheel Forest, Desert Resort and Twist Mountain, in Icirrus City during the Winter time only and you can also get it as a prize for beating all of the trainers on the Royal Unova on Sunday.ORWhenever the cheat codes come out for Pokemon Black and Pokemon White (In your case). You can get the cheats off there. I do NOT know when the cheats will come out for this game but the sooner the better.
it's the dowsing MCHN, When you find an item it will make noise and blink. if you dont see ANYTHING, its hidden. to do that when it finds an item, (thats hidden) walk back ONE step and turn where the item was. press the A button. Wallla! an ITEM APEARRED OUT OF NOWHERE! hope this helped u!
Tm Iron Tail is near the village bridge but u have to use the dowsing machine in order to find it