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You can in diamond and pearl. You need the explorers kit which you pick up in Eterna city. Then you use it to go underground anywhere you want. Depending on where you go down, you will appear in different places.
You speak to a man underground a trade a sphere for a digger drill.
When you have the drill, find a secret place and dig out your base in the wall.
You can buy decorations for your base from the veilstone department store on the 4th floor i think.
When you have a base, go around stealing other trianers 'trainer flags' the more you steal the better you base can become.
What else can I help you with?
Can you build bases underground on diamond?
Yes
How do you make a underground base in sapphire?
You can only make normal above ground bases, underground bases are only in diamond and pearl and platinum.
How do you find a person underground in Pokemon diamond?
If you are referring to secret bases, then a WiFi connection is needed.
Remove boulders in secret bases on Pokemon Diamond?
You have to meet other people and take their flags in the Underground.
Is there any hiding places in Pokemon?
There are secret bases in Pokémon Ruby Sapphire and Emerald. In Diamond Pearl and Platinum, you have underground bases.
Where do you get heartcales in Pokemon Diamond?
In the Pokemon diamond underground.
Are there Pokemon underground in diamond?
no
Where in the underground do you get ether on diamond Pokemon?
ether is not found in the underground. sorry.
Where is the underground in poke mon crystal?
The underground started in diamond and pearl so there is no underground in crystal.
How do you get gems in Pokemon diamond?
the underground
Were to get the waterstone in diamond?
in the underground tunnels.
Where can you get Ovalstone on Pokemon Diamond Pearl?
lost towerfloor2 and underground rare in underground
