part 1:getting started
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first of all to go underground you will need an explorers kit,to get this you will need access to Eterna city when you do fly/go to the pokemon center and right next to it (to the right) there will be a house go i and talk to the old man as a usual old person would he starts to talk about his old days when he was an explorer(that is if memory serves me correct if not please notify me)then he will give you an explorers kit and tell you to go underground do as he says and when there you will meet a not so old friend,once you have talked to her go back up and talk to the old man keep on doing these missions and after mission 4 he will reward you with furniture for your new base say bye bye to the old timer for if you are like me you may never see him again
part 2:digging
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look for the little sparkles on the top screen then move over to them touch the bottom screen and you will use your scanner when found walk up to them and press ''a'' be careful though the ones on the ground are traps.when you have done this the whole point of being under ground begins.watch the top of your bottom screen to see where the crack is (every time u hit somewhere it grows) when it gets to the opposite side it started at bye bye mr.wall
part 3:flags
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whenever u go underground if there is another person and you go to their secret base and go to their flag(there flag is located to the right of their laptop) (you have to be facing the wall closest to you)then press a start running to your base like a dude with a chainsaw is chasing you and your base is the cops then once inside pretend the flag beside your laptop is the policeman so u gotta tell him (in other words if they catch u and press a it goes back 2 their base heres how it goes (and this is from the official book)
normal flag
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*you have never obtained a flag yet
*you can place up to 15 goods in your base
*you cant remove any rocks
bronze flag
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*you have obtained 1 flag
*you can place up to 12 goods in your base
*you can remove 1 rock
silver flag
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*you have obtained 3 flags
*you can place up to 14 goods in your base
*you can remove 5 rocks
gold flag
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*you have obtained 10 flags
*you can place up to 15 goods in your base
*you can remove 10 rocks from your base
*you can use fossils,spheres and trap radar
platinum flag
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*you have obtained fifty flags
*you can place up to 15 goods in your base
*you can remove all the rocks