Guides

Pokemon Brilliant Diamond and Shining Pearl Grand Underground Guide

The Grand Underground in Pokemon Brilliant Diamond and Shining Pearl is an underground area that can be accessed at any point using the Explorer Kit, obtained from the Underground Man found in Eterna City. Depending on what section of the Underground you want to be in you will need to use the Explorer Kit.

Grand Underground Guide

Map of Grand Underground Locations and were you can access the underground, just below that you can find links to out guides on each of the Grand Underground Cave Locations and what pokemon spawn.


Mining

In the Underground, one of the main things you can do is excavate the walls and dig up useful materials and items. To begin excavating you will need to look at your map for shining marks on the walls and interact with them. That will begin a mining mini-game which allows you to dig up items, these items include; Spheres, Fossils, and Plates.

 

Below is a list of all the Spheres that can be found in the Underground in Pokemon Brilliant Diamond and Shining Pearl. Spheres are the currency of the Grand Underground. Spheres can also be buried in the Underground if left for a while, their worth and size will increase.

Item Worth Size Rarity
Blue Sphere1 to 10(Small)(Common)
Blue Sphere.11 to 21(Large)(Common)
Green Sphere1 to 10(Small)(Common)
Green Sphere11 to 21(Large)(Common)
Pale Sphere1 to 10(Small)(Uncommon)
Pale Sphere11 to 21(Large)(Uncommon)
Prism Sphere1 to 10(Small)(Uncommon)
Prism Sphere11 to 21(Large)(Uncommon)
Red Sphere1 to 10(Small)(Common)
Red Sphere11 to 21(Large)(Common)

Vendors

Vendors are stationary NPCs that can be found all around the Underground, some sell traps, items, and decorations for your base. Their prices and stock change daily and they accept Spheres as currency.

 

The Grand Underground Pokemon Spawns

Below is a list of all the pokemon you will encounter while adventuring the Grand Underground in Pokemon BDSP. Depending on how far you are in the game will determine the pokemon levels you will encounter in the grand underground; reaching these checkpoints will cause NEW pokemon to begin to spawn in the underground.

Progression Check Pokemon Lv NEW Spawns
1st Gym Leader Roark16 - 20
2nd Gym Leader Cardenia25 - 29
3rd Gym Leader Fantina29 - 33After you obtain Defog (TM97)
4th Gym Leader Maylene33 - 37
5th Gym Leader Crasher Wake36 - 40
6th Gym Leader Byron39 - 43After you obtain Strength (TM96)
7th Gym Leader Candice42 - 46After you obtain Rock Climb (TM100)
8th Gym Leader Volkner50 - 55After you obtain Waterfall (TM99)
Elite Four and Champion Cynthia58 - 63After you obtain National Dex - Post Game
Grand Underground Locations and Pokemon Spawns

The Grand Underground Items

Below is a list of all the fossils that can be found in the Grand Underground. They can be taken to the Oreburgh Mining Museum to be revived into a Pokemon.

Fossil What It Does Rarity Requirement
Armor Fossil Revives into Shieldon (Uncommon)(Pearl Only)
Skull Fossil Revives into Cranidos (Uncommon)(Diamond Only)
Claw Fossil Revives into Anorith (Rare)(After National Dex)
Dome Fossil Revives into Kabuto (Rare)(After National Dex)
Helix Fossil Revives into Omanyte (Rare)(After National Dex)
Old Amber Revives into Aerodactyl (Rare)(After National Dex)
Root Fossil Revives into Lileep (Rare)(After National Dex)

Plates are items that increase the Power of certain moves when you equip your pokemon with this item, they are also used to change Arceus Type when held.

Item Where To Find
Draco Plate
Raises power of Dragon moves
The Grand Underground
Using Dowsing Machine Pokétch App.
Dread Plate
Raises power of Dark moves
Old Chateau
The Grand Underground
Earth Plate
Raises power of Ground moves
Oreburgh Gate
The Grand Underground
Fist Plate
Raises power of Fighting moves
Route 215
The Grand Underground
Flame Plate
Raises power of Fire moves
The Grand Underground
Using Dowsing Machine Pokétch App.
Icicle Plate
Raises power of Ice moves
Route 217
The Grand Underground
Insect Plate
Raises power of Bug moves
The Grand Underground
Using Dowsing Machine Pokétch App.
Iron Plate
Raises power of Steel moves
The Grand Underground
Using Dowsing Machine Pokétch App.
Meadow Plate
Raises power of Grass moves
The Grand Underground
Using Dowsing Machine Pokétch App.
Mind Plate
Raises power of Psychic moves
Solaceon Ruins
The Grand Underground
Sky Plate
Raises power of Flying moves
Pokémon League The Grand Underground
Splash Plate
Raises power of Water moves
Route 219
The Grand Underground
Spooky Plate
Raises power of Ghost moves
Amity Square The Grand Underground
Stone Plate
Raises power of Rock moves
The Grand Underground
Using Dowsing Machine Pokétch App.
Toxic Plate
Raises power of Poison moves
Great Marsh
The Grand Underground
Zap Plate
Raises power of Electric moves
The Grand Underground
Using Dowsing Machine Pokétch App.

Miscellaneous Items are items that you will find instead of Fossils, Plates and Spheres. These items range from held items such as Fire Stones, to Max Revives. If you have no use for these items, you can sell them to the Vendors for extra currency.

Item Where To Find
Max Revive
Revives a fainted Pokémon and fully restores it's HP
Cost: N/A
Route 213
Galactic HQ Stark Mountain
The Grand Underground
Pickup Ability Using Dowsing Machine Pokétch App.
Revive
Revives a fainted Pokémon and restores half of it's max HP
Cost: 1,500
Pokémart (Must have at least 3 Badges) Route 212
Route 225
Wayward Cave
Lost Tower
Valley Windworks
Mt. Coronet
The Grand Underground
Pickup Ability Using Dowsing Machine Pokétch App.
Damp Rock
Prolongs number of turns of Rain Dance
The Grand Underground
Everstone
Prevents user from evolving when equipped
Snowpoint City
The Grand Underground
Wild Geodude
Wild Graveler
Hard Stone
Any Rock-type move's power is increased by 10%
The Grand Underground
Wild Corsola
Wild Aron
Wild Nosepass
Heat Rock
Prolongs number of turns of Sunny Day
The Grand Underground
Icy Rock
Prolongs number of turns of Hail
The Grand Underground
Iron Ball
Lowers speed of holder, also makes Flying-types and Levitate Ability using Pokémon vulnerable to Ground moves when equipped to them
Iron Island
The Grand Underground
Light Clay
Prolongs effect of Reflect and Light Screen
The Grand Underground
Mt. Coronet
Smooth Rock
Prolongs number of turns of Sandstorm
The Grand Underground
Fire Stone
A stone that can be used to evolve Growlithe, Vulpix and Eevee
Fuego Ironworks
The Grand Underground
Leaf Stone
A stone that can be used to evolve Gloom, Weepinbell, Exeggcute, and Nuzleaf
Floaroma Meadow
The Grand Underground
Moon Stone
A stone that can be used to evolve Nidorina, Nidorino, Clefairy, Jigglypuff and Skitty
The Grand Underground
Wild Clefairy
Wild Cleffa
Wild Lunatone
Oval Stone
Evolves Happiny into Chansey when equipped and leveled at Morning or Day (4:00am - 7:59pm)
Lost Tower
Wild Chansey
Wild Happiny
Sun Stone
A stone that can be used to evolve Gloom and Sunkern
The Grand Underground
Wild Solrock
Thunder Stone
A stone that can be used to evolve Pikachu and Eevee
Sunnyshore City The Grand Underground
Water Stone
A stone that can be used to evolve Poliwhirl, Shellder, Staryu, Eevee and Lombre
Sunnyshore City The Grand Underground

Almost all Slates in Pokemon Brilliant Diamond and Shining Pearl are items used to encounter Legendary Pokemon in the Ramanas Park when brought to the correct pedestal. Slates can be obtained by trading Mysterious Shards in the Grand Underground. Below is a list of all the Slates and what Pokemon they summon.

Slate What It Does
Discovery SlateUsed to summon Regice, Registeel, and Regirock
Kanto SlateUsed to summon Articuno, Zapdos, and Moltres
Johto SlateUsed to summon Entei, Suicune, and Raikou
Soul SlateUsed to summon Latias and Latios.
Rainbow SlateUsed to summon Ho-Oh
Squall SlateUsed to summon Lugia
Oceanic SlateUsed to summon Kyogre
Tectonic SlateUsed to summon Groudon
Stratospheric SlateUsed to summon Rayquaza
Genome SlateUsed to summon Mewtwo
Distortion SlateUsed to acquire the Griseous Orb

Underground Man's Quests

The Underground Man who gives you the Explorer Kit is located next to the Pokemon Center in Eterna City. He will give you missions that, if completed- he will reward you with useful items. Below is a list of the missions and their rewards.

Quest Rewards
Go UndergroundMove Trap (Up), Bubble Trap, Leaf Trap
Dig Up an ItemPrism Sphere 1, Red Sphere 1, Blue Sphere 1
Bury a SphereDigger Drill
Make a Secret BasePlain Table, Wooden Chair, Small Bookshelf, Buneary Doll
Decorate Secret BaseDoll of your Starter (Turtwig, Chimchar or Piplup)
Capture 1 FlagBronze Flag, Base Upgrade (Up to 12 Decorations), Pretty Gem
Capture 3 FlagsSilver Flag, Base Upgrade (Up to 15 Decorations), Shiny Gem
Capture 10 FlagsGold Flag, Base Upgrade (10 Rocks Removed), Mystic Gem
Capture 50 FlagsPlatinum Flag, Base Upgrade (All Rocks Removed), Glitter Gem

Secret Bases

Down in the Underground you have an option to make a Secret Base that you can decorate and also use for a mini-game with a friend. To make a Secret base you will need a Digger Drill, one can be obtained from the Underground Man for completing one of his quests, or finding a vendor in one of the corners of the Underground. The Digger Drill is a one use item but more can be obtained. By default you will only be able to place 10 items.

 

Note: The player can only have one Base at a time and if another Digger Drill is used, the old base will be removed.

 

Flag Retrieval

This is a mini-game which can be played with another person and is a Capture The Flag gamemode. You will need to steal a flag from your friend's base and bring it back to your own. This is where traps come into play, there are different kinds of traps someone can place down to slow down their opponents. Some types of traps include; Reversing Player Controls or Strong Winds that blow your opponent in a specific direction. The player can hold up to 50 traps at a time. The winner of the game will obtain upgrades for their own base to allow more items to be placed down. Once you capture at least 50 flags, all of the boulders left in your Base will be removed.

 

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