First, you need an explorer kit. Then, you need to keep doing the lessons the underground expert tells you to do in Eterna City.
on all the way to the right of eterna city, there is a house. go inside and an old fart should be there. if not, try a different house. the old dude will give you an Explorer Kit. go outside, use it, and voila! ur underground. tap the touch screen and sparklies should appear on the top screen. if a sparkly appears on the bottom, go to that wall and hit A. tap the hammer and start looking. light brown=1 tap. gray=2. rock=3.
You cant buy any fire stones in pearl or diamond but you can find them underground by digging into walls. They are easer to dig up after you get the national-dex. Hope i helped!
There are 2 places. If you go to Oreburgh city (first time going), you will go to an underground mine. And in Eterna City ( the next city after Oreburgh), in 1 of the buildings there is someone called underground man. he will give you an explorers kit. which has a shovel to dig underground
The only way I know of to get a sky plate in diamond/pearl, is to dig in the underground. it's a pretty rare item there, but i do not believe there is any other way.
You can get a blue, green, red, pale, and prism orb underground.
its the rarest thing in the underground also it behind the Pokemon statue in Eterna City
Go underground by using your toolkit, then keep digging for treasure until you get lucky
Dig Underground
Dig it out in the underground.
Go underground and dig.
You have to dig underground.
Dig underground and it should be there
its underground. you can dig it up.
you can dig 1 out of the walls underground
dig in the underground and you can get them of wild geodude and graveler
YOu can dig underground for it but its rare.
You gotta dig it up (underground.)
If you're referring to going underground. You cant.