Use the itemfinder then press A.
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use the iem finder to lead you in the direction of the buried item. Once you get pretty close to being right by it press A. If you don't pick up the item then you an't in the right place, just walk around and press A. Eventually you will pick it up. If this don't work get a Pokemon with the ablity to pick up buried items. (example of Pokemon with this ablity- Poochyena.)
you get either Pokemon sapphire or ruby and you link and restart the whole game on ruby or sapphire pick out a Pokemon and get to a Pokemon center and link to the other gba and trade for another Pokemon and repeat like twice
If you are talking about the starters..then,U are able to pick from Torchic,Treecko,Mudkip.
step on it
I use a Zigzagoon the higher the lv the better items it will pick up.