when you have got the itemfinder. Click start then click on bag and then press the right button on your +control pad. click on the itemfinder then click use. The itemfinder will detect any items around you that are berried.
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Use the itemfinder where Mr. Fuji was in the Pokemon Tower.
Rocket Hideout in Celadon Game Corner. Use itemfinder near where Giovanni was.
The itemfinder works when it finds a secret item around your current area for example on One island if you go south you can reach a treasure beach using the itemfinder you can spot hidden items and dig them up. Also if you use it where snorlax and Giovanni and mr fuji used to be you will find super secret items.
You should be able to receive an Itemfinder off one of Professor Oak's aides on Route 11. However, you need to have captured 30 Pokemon or more to receive it.
1st. Go to the Gym in Viridian City 2nd. Stand Where Giovanni stand 3rd. Use the Itemfinder 4th. There you have the Macho Brace