Once you get an explorers kit, you can go underground. Once there, just tap the lower screen until you see sparkles on the walls and/or ground. Then walk up to them and press A. You should be able to dig for items there. You can find a range of useful items such as Heart Scales and Spheres that you can trade for valuable items with the people you find in the underground.
yes
Spheres in Pokemon diamond are found underground. Go underground using the explorer kit, touch the touch screen and look at the some shinning things(this means there is a sphere or treasure), if you're near the shinning things, touch the touch screen and you will see were they are located (they are still shinning things but you can see them in the touch screen), then go in front of them then press A.
Pokemon diamond
you get a digger drill from an old man in a house next to the PC or you can buy it from hikers for about size 11 spheres
you cant be a Pokemon in Pokemon diamond
There is no such thing as them.
simply give your spheres to one of your pokemon then just trade pokemon and ask your friend to take the item.
you can not buy them but you can find them in the underground
yes
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fossils, shards, stones, plates, spheres
Find people underground that look like hunters and you can buy traps and goods with your spheres
Some people underground, they look like hikers, will sell you traps or goods for spheres, or they want to buy them.
Spheres in Pokemon diamond are found underground. Go underground using the explorer kit, touch the touch screen and look at the some shinning things(this means there is a sphere or treasure), if you're near the shinning things, touch the touch screen and you will see were they are located (they are still shinning things but you can see them in the touch screen), then go in front of them then press A.
You can sell it to that hiker guy
Pokemon diamond
You trade the spheres, or you can talk to the guy in harthome that gives you rare things, or you can get i from the digging guy in harthhome after you talk to him after making a base.