A Secret Base is a special area that you can create and decorate with the statues you find from excavating in Pokemon Brilliant Diamond and Pokemon Shining Pearl. This Secret Base Guide will tell you everything you need to know about them.
Once you have access to the Grand Underground, you will be able to use a Digger Drill to make a Secret Base. To create a Secret Base in the Grand Underground, you need to face an area of wall that you want to become the entrance, then select the Digger Drill from the 'Traps' menu. If you now press the A button on your Nintendo Switch controller, you will burrow a hole into the wall. In order to obtain the Digger Drill which is a one time use item, you must complete the Underground Man's third mission which involves digging up treasures. It is however possible to purchase more drills from the Sphere Traders in the Grand Underground, these traders look like hikers and the Digger Drills will cost you a random amount of Small Spheres.
There are certain Sphere Traders in the Grand Underground that can expand your Secret Base, which will then enable you to increase the amount of statues you can place. Pacing statues in your Secret Base will increase the spawn rate for different Pokemon types you find in the Pokemon Hideaways. Pedestals which can also be purchased from Sphere Traders can be used to customize your displayed statues. You can enter Photo Mode while you are inside your Secret Base by pressing the Y button on your controller. You can use the left thumbstick on your controller to pan or zoom around and take pictures of your statue collection.
Check out our Ramanas Park Guide to find out everything you need to know about this new feature in Pokemon Brilliant Diamond and Pokemon Shining Pearl.