Easy just go to Eterna City and go to the House next to the Pokemon Center, There is old man inside the house go talk to him and he will give you some missions, and for his last mission he will tell you to make your own underground base. He will give you the items to make your base.
by Erren
You can only make normal above ground bases, underground bases are only in diamond and pearl and platinum.
all you have to do is buy a digger drill from a dude and then go to the wall of the place you want your base to be and then go to trapps and click on digger drill its as simple as that
A Digger Drill allows you to make a base underground.
it goes away
Use a Thunderstone on it. There is one in Sunyshore City. You can also look for some in The Underground.
exactly the same way you would in diamond or pearl , you have to get a digger drill go to a wall and drill a hole and there you will have your under ground base but i think you need to talk to the old man in eterna city first and do his missions
You can use it anywhere as long as you use it on ground. you can also dig and make secret bases underground!
Open every item lying around and make good use of your ItemFinder. You can also find them in the underground.
You have to go underground to get it as a fossil and then go to Oreburge City and go to the building above the Pokemon center and talk to the man at the desk. He will make it Sheildon.(In pearl only)
Hello There. Well first you need an Explorer Kit. You can get it from the old man in Eterna City He lives right next to the Pokemon Center. Then you need to do things for him and he'll let you make a secret base. (You'll make it underground) But you will need a Digger Drill to use on a wall. Once there's a hole. That's your secret base. I hope I helped.
first you need a underground kit from eterna city and do some kind of tests until you get to the test where you can make your secret base.
you make sure you have enough space to put it in first , then you can just put it in .