Regester it in the Key Items pocket of your bag and exit your bag. Than press Y and alow it to save. Then you are in the undergrounds. Hint for the undergrounds - On the top screen in a map of the undergrounds and where the gold sparks are is where hidden treasure is. Use the Stylest (pen, stick) to tap and look for stuff.
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you use an explorer kit in any town and it already has tools
you cant get an explorer kit Pokemon Sapphire dosent use wi-fi you can get an explorers kit at Pokemon diamond, Pokemon pearl, Pokemon platinum and that's it :[]
go to key items find it and hit use save and your in underground
Use the explorer kit touch the bottom of the screen see if there is any thing you might be lucky
You use your explorer kit..go under ground and when you try and find for treasures you might get lucky and find one:)