Just surf over to treasure beach, and use your itemfinder. The amount of items varies, though. Sometimes, it will only be a couple ultra balls, while other times it will be a few sellable items.
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go to one island. on the pier, surf on the left side of it. go down to the beach
its not on treasure beach
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.
In FireRed, you can catch Spearow at these locations: Routes 3, 4, 9, 10, 11, 16, 17, 18, 22, and 23, Treasure Beach, Mt. Ember, Cape Brink, Ruin Valley, Water Path, and Canyon Entrance.
You have to have a toy code. Type it in the unlock items part and you will be in the treasure book.