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.
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i dont have sapphire
As far as the game goes, you can't duplicate Pokemon on Sapphire. Tried it and it glitched up.
I think you need a Pokemon with a specialy natural ability that will dig up items if you walk over them.
In the underground
you have to dig it up when you are underground