on lilycove department store clear out sales go to the top of the store and talk to the person next to the vending machine and buy a solid board. it will cover cracks in secret bases.
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To find your Secret Base, talk to the short guy in a house in western Mosdeep City. He will mention a base on a certain route. Go there, and find your Secret Base on that same route!
all you have to do is go into your secret base it says this is your secret base go in say yes then it says leave door open or close and decorate just select that.
Get the TM secret power teach it to a Pokemon then find either a tree with vines, an indent in the wall or a big bush use secret power on these to create your own secret base.
To get an underground secret base, you have to go down there and buy it from a hiker who is selling Traps.He should have a Digger Drill for sale.Buy the Drill from him, then use in on any random underground wall, and... BING!Your secret base is born.
yes you can if you can't do under ground you have to get an explorer kit. but when you do you have to get an digger drill. and pick aplace to have your secret base. :)