This is a guide to the Grand Underground in Pokemon Brilliant Diamond and Shining Pearl (BDSP). Read on to learn how to dig for treasure and Pokemon Statues, how to build a secret base, what Pokemon are found in Hideaways, and the online features of the Grand Underground!

All Grand Underground Guides

Grand Underground Maps & Data HOT
All Underground Pokemon	Grand Underground Map: Items & NPC Locations
Grand Underground Guides
Pokemon Hideaways	Underground Man Missions
List of Statues and Effects	How to Get Shiny Statues
Digging for Treasure	All Treasures and Appearance Rates
How to Make a Secret Base	How to Find Diglett
Sphere Trader Locations	List of Spheres
List of Pedestals
Removed Features
Capture the Flag	Traps
Decorations

Grand Underground Pokemon Hideaways

All Hideaways and Pokemon

Hideaways and List of Pokemon
Fountainspring Cave	Stargleam Cavern (Various types)	Dazzling Cave (Various types)
Grassland Cave	Spacious Cave (Various types)	Big Bluff Cavern
Riverbank Cave (Various types)	Volcanic Cave	Sandsear Cave
Rocky Cave	Bogsunk Cavern	Still-Water Cavern
Whiteout Cave	Icy Cave	Glacial Cavern
Swampy Cave	Typhlo Cavern	Sunlit Cavern (Various types)

Catch Exclusive Pokemon

Pokemon Hideaways are a new feature added to Brilliant Diamond and Shining Pearl. These are places where different Pokemon can be found and caught. Some Pokemon are exclusive to Pokemon Hideaways and cannot be found anywhere else on the Sinnoh map.

All Underground Pokemon

Pokemon Spawns Depend on Statues

Pokemon that can be encountered in Pokemon Hideaways vary and can depend on which Statues are placed in the Secret Base, so players should dig often to get more Pokemon Statues and unlock more exclusive Pokemon!

Pokemon Hideaways Guide

Grand Underground Features

Grand Underground Features	Solo or Online
Digging for Treasure	Solo and Online
Building a Secret Base	Solo
Farming Diglett	Solo and Online
Underground Man Missions	Solo
Unlocking Spiritomb	Solo

In Pokemon Brilliant Diamond and Shining Pearl, the Underground feature returns as the greatly expanded Grand Underground!

Talk to the Underground Man

To unlock the Grand Underground, you'll need to speak to the Underground Man in Eterna City in the house to the right of the Pokemon Center.

He'll give you the Explorer Kit and will give a brief tutorial on how to use it to enter the Grand Underground!

New Features & Differences from Originals

How to Dig for Treasure in Grand Underground

Use Sledgehammer or Pickaxe

Dig for treasure by tapping the sledgehammer (red) or pickaxe (blue) to uncover the selected area. You can switch between the two tools by pressing R. The sledgehammer removes large sections of rock, but makes the wall collapse faster. The pickax chips away only small pieces, but contributes very little to wall collapse.

The wall collapses when the crack at the top of the screen reaches the left side. Make sure to find all treasures before the wall collapses.

Digging for Treasure and Spheres

Obtain Fossils, Spheres, or Statues

Trainers can find Fossils, colored Spheres that can be used to buy Goods and Traps, and Pokemon Statues that can be displayed in Secret Bases while digging in the Grand Underground.

List of Treasures

Obtain Mysterious Shards

In the postgame, players can also find Mysterious Shards when digging in the Grand Underground. These shards are necessary to purchase slates at Ramanas Park which will give you access to different legendaries!

Ramanas Park

How to Build a Secret Base in Grand Underground

Use Digger Drill

To create a Secret Base, use a Digger Drill from the Traps menu when facing any wall of the Grand Underground in order to burrow a hole into it. Players can only have 1 Secret Base. Building another will dismantle the existing base.

How to Make a Secret Base

Decorate the Secret Base

Decorate the Secret Base with Statues that you obtained through digging. The statues placed in the Secret Base determine what Pokemon will appear in the Pokemon Hideaways.

Diglett in the Grand Underground

You can find Diglett and even Dugtrio roaming aroudn the tunnels of the Grand Underground. These drop pink sparkles that will fill up your gauge and improve your chances of digging up Gorgeous Stone Boxes!

How to Find Diglett in the Grand Underground

Grand Underground Man Missions

The Underground Man is located in Eterna City, in the house to the right of the Pokemon Center and gives you tutorial missions on the Grand Underground. Do these missions to obtain Underground items for free and to get quickly familiar with the features of the Grand Underground.

Underground Man Missions	Rewards
Visit Grand Underground	・Red Sphere S ・Blue Sphere S ・Green Sphere S
Dig up treasure or spheres	・Digger Drill
Create a Secret Base	・Square Pedestal XS ・Sturdy Pedestal S
Visit Another Player's Secret Base	・Round Pedestal M
Find a Light of a Different Color	・Ability to Dig more Treasures ・Clear Pedestal

Underground Man Missions and Rewards

Unlock Spiritomb in Grand Underground

How to Unlock Spiritomb via the Grand Underground
Place Odd Keystone in Hallowed Tower Talk to 32 NPCs in Grand Underground Return to Hallowed Tower and battle Spiritomb

Place Odd Keystone in Hallowed Tower

You can get the Odd Keystone from a Black Belt trainer on Route 208, as a hidden item in Twinleaf Town, or while digging for treasure in the Grand Underground. Once you've acquired it, place the Odd Keystone in the Hallowed Tower on Route 209 (the crumbled structure near the easternmost river).

Talk to 32 NPCs in Grand Underground

In the original games, you had to talk to 32 Players to increase your tally. As you can no longer interact with other players in the Grand Underground, you now need to talk to 32 NPCs to bring up your tally.

Talk to 32 Different NPCs

Unlike in the original games where you can talk to the same player 32 times, you now need to talk to 32 different NPCs to bring up your tally!

Sphere Traders Don't Count to the Tally

Sphere Traders are Hikers that will trade useful items to you for spheres. Although counted as NPCs, talking to them doesn't count to your tally.
Sphere Trader Locations

Return to Hallowed Tower

After talking to 32 NPCs, return to the Hallowed Tower and interact with it to trigger a battle where you can catch Spiritomb.

Removed Features

Capture the Flag

It's no longer possible to play the Capture the Flag minigame in the Grand Underground. You can still visit other players Secret Bases and check out their displayed statues!
Can You Play Capture the Flag?

Placing Traps

It's no longer possible to set up traps in the Underground and in your Secret Base. These items were replaced by pedestals, which are cosmetic items that you can use to decorate statues.

Can You Place Traps in the Grand Underground?

Decorations

It's no longer possible to use decorations such as furniture to customize your secret bases. However, it's still possible to decorate secret bases using pedestals and statues.

Can You Decorate Secret Bases with Decorations?

Burying Spheres

In the original games, it was possible to bury Sphere to increase their size over time. However, this feature has been removed in the remakes, so you'll need to be patient and keep digging to find large Spheres.

Pokemon BDSP Related Guides

Brilliant Diamond & Shining Pearl Wiki

Brilliant Diamond and Shining Pearl Guides
Pokedex	Story Walkthrough
Maps and Locations	Grand Underground
Moves	Items
Abilities	Beginner's Tips & Guides
Training and Breeding	Battle Tower
Tier List & Movesets	Message Boards
News and Game Info	Characters