If you're referring to going underground. You cant.
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In the underground
You have to 'dig for treasure'. What you do is click the ground (grass) and one of the options will say ' dig for treasure'. Click it and your sim will dig for treasure. Not all the time will you find a map. Sometimes it can be a bone, or something else.
Go beneath the statue and just dig there. If a gardener attacks, you can either run away or defeat them and then dig for the treasure.
select a Pokemon who knows dig.
You have to go underground and and use the your stylus and touch the screen. if you see shiny dots, then go to the spot where it is and press a. it will say there is a gap and ask you if you want to mine. say yes and dig for your treasure!