You don't need to dig to get an item if the itemfinder responds. All you have to do is follow the signals on the itemfinder until you reach the spot where the item is. Then you press the space in front of you, or next to you and you should pick up the item.
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Face the spot where the item is buried and click A, or use the Item Finder on top of the spot.
Find snorlax then stand in the exact spot where it was then use the itemfinder and you will dig up a item it is the leftovers.
Not sure what you mean by glasses, but if it has to do with itemfinder, just stand in front of the scanned item, and keep pressing 'a' until you get it.
Once you have the itemfinder and pokeflute go to the top of Pokemon Tower which is in Lavendar Town, once your at the top stand in the spot where Mr Fuji used to be and use the itemfinder if your in the right spot you should dig up a Soothe Bell item.
The itemfinder will point you in the direction of where hidden items are press A in that direction to find the item.