The Grand Underground – Pokémon Brilliant Diamond & Shining Pearl guide

Pokémon Brilliant Diamond and Shining Pearl overhauled the underground feature to add more sprawling caverns, turning it into the Grand Underground. Our Grand Underground guide will explain what to do there, how to build your base, and what rare Pokémon to look for.

Table of contents

  • How to unlock the Grand Underground
  • How to build a secret base
  • How to dig for treasure and statues in the Grand Underground
  • How to find Pokémon in the Grand Underground
  • What do the Diglett and Dugtrio in the Grand Underground do?

How to unlock the Grand Underground

You’ll unlock the Explorer Kit in Eterna City — in fact, you can’t leave the city without getting it and learning how to use it. The old man who hands out the Explorer Kit is in a house next to the Pokémon Center.

How to build a secret base

You can put a base in any wall in the Grand Underground, as long as you have a Digger Drill. After you dig up some treasure for the first time, you can return to the old man in Eterna City, and he’ll give you a Digger Drill to make a base with. Press A on a wall to open up a huge cavern to build your base in.

Once you build your base, you can place any statues that you dig up inside to decorate. These statues increase the rate in which certain Pokémon appear in the Grand Underground.

Image: The Pokémon Company/ILCA Inc via Polygon


How to dig for treasure and statues in the Grand Underground

You’ll see sparkling spots marked on your map. As you get close, you can press R to use your radar, which will pinpoint the location of the treasure on a nearby wall.

Just like the original games, you’ll be able to use the heavy hammer or the delicate pickaxe to dig up treasure in Pokémon Brilliant Diamond and Shining Pearl. Be careful, though: After you dig too much, the wall will collapse.

Use the hammer to find the treasure, and then switch to the pickaxe to carefully dig it out.

How to find Pokémon in the Grand Underground

There are lots of rare Pokémon in the Grand Underground that weren’t in the original games. If you want a Magnemite, Togepi, Ralts, or other Pokémon that were in the Platinum Pokédex, the Grand Underground is your place to look.

These Pokémon are found in their respective biomes, called Pokémon Hideaways. You’ll find Ralts in glittering caves, Togepi in lush springs, and Magnemites in dark caves, for example.

Image: The Pokémon Company/ILCA Inc via Polygon


What do the Diglett and Dugtrio in the Grand Underground do?

As you run around, you’ll notice Diglett and Dugtrio sitting at intersections. When you approach them, they’ll flee, leaving behind some pink glitter. Picking up the glitter fills a gauge on the left side of your screen. Once the gauge is filled, a notice will come up saying “Something good will happen!”

With this bonus, you’ll dig up special green glittering statues from the walls. Once you dig up three, the bar will deplete back to zero.

There’s speculation that these statues increase your chances of finding Shiny Pokémon, but we aren’t able to confirm this yet.

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