>Firstly, you need the 'Explorer's Kit', which is given to you by an old man in Eterna City, in the building to the right of the Pokemon Center. When you use it, you will find yourself underground.
>You can tap the touch screen and it will give out a signal. It will either show nothing or beep. If there is nothing keep walking around and do it again.
>If there are items in the area, it will beep and shiny 'stars' appear, with white stars indicating traps and yellow stars for treasure. Treasures are usually found on walls.
>Walk to a wall with a yellow star and hit 'A'. You initiate the mining activity.
>Choose a tool on the right side and just tap the touchscreen areas of rock until you find treasures. Be careful though, the wall could collapse before you find any, the top bar represents its stability.
>Once your done, just find more treasure. Also, if you want to keep your items, hit 'Y' and open up the treasures menu, highlight the treasure and pick 'Send to bag'.
>Additionally, the man who gave you the kit will give you tasks to do if you speak with him after your first trip underground. He will also teach you many basics to mining.
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You can't mine underground in either Pokemon Heartgold or Soulsilver, but you can mine underground in Pokemon Diamond, Pearl, Platinum.
You have to go to the underground.
underground
You can find everstones underground
You get a leaf stone underground.