Grand Underground 地下大洞窟 Grand Underground Cave "Wild Missingno. appeared!"
Recommended Level:	{{{reclvl}}}
Map description:	{{{mapdesc}}}
Location:	BeneathSinnoh
Region:	Sinnoh
Generations:	VIII
Location of Grand Underground inSinnoh.
Pokémon world locations

TheGrand Underground (Japanese:地下大洞窟Grand Underground Cave) is an area inPokémon Brilliant Diamond and Shining Pearl found beneath the entireSinnohregion. Players can travel to the Grand Underground using anExplorer Kit, given to the player by theUnderground Man inEterna City.

It takes the place of theUnderground fromPokémon Diamond, Pearl, andPlatinum.

Changes from Diamond and Pearl

• The map is still split into six disjoint areas like the original Underground, but the sizes and locations of the six areas do not match those of the original Underground.
• Areas now include Pokémon Hideaways, and each area now corresponds to a different aesthetic environment.
• The digging minigame returns following closely to its original incarnation with the exception of digging up Pokémon statues, which come from Stone Boxes.
  • If the player runs out of digging spots, more will appear once the player enters and exits a Hideaway.
  • As of theversion 1.1.0 update, after the Sinnoh Pokédex is completed,Mysterious Shard S andMysterious Shard L will start appearing in the underground for use inRamanas Park.
• Secret Bases return and are created using aDigger Drill as before.
  • Bases can only be decorated with statues and pedestals to place them on.
  • The flag stealing mechanic has been removed.
• Goods andTraps, with the sole exception of the Digger Drill, have been removed.
• Spheres no longer have a numerical size and are instead categorized as Small or Large. They can no longer be buried either.
• Instead of goods or traps, merchants (who appear asHikers) in the Grand Underground can exchange treasures and for spheres. Spheres can now be exchanged for pedestals, items, and TMs.
  • Some Hikers found in the Grand Underground allow the player to rest, acting as aPokémon Center.
• The radar is now triggered by pressing [R] and searches the area around the player's location.
• The Grand Underground supports online communication, compared to the original games which only supported local communication.
• Steps taken in the Grand Underground count towardsEgg distance as well as the step counter app.
• Diglett andDugtrio will occasionally pop out and leave pink sparkles that give 1 and 3 points respectively, and accumulating 40 of these points causes"something good to happen". This results in a variety of special effects lasting for a period of 4 minutes, which begins and ends when a whistle is heard:
  • The odds to encounter aShiny Pokémon in Hideaways is raised from 1/4096 to 1/2048.
  • All Stone Boxes found while digging will be Gorgeous Stone Boxes.
  • The progress gauge and bonus period is shared between all players connected to the same instance of the Grand Underground. If all connected players leave the Grand Underground, this gauge resets to zero.

Zones

The Grand Underground is organized into six zones, with each zone containing Pokémon Hideaways.

North-western	East and West	North-eastern
South-western	Central	South-eastern

Pokémon Hideaways

Pokémon Hideaways (Japanese:ポケモンの隠れ家Pokémon Hideaway) are new places wherewild Pokémon can be encountered. Unlike the main overworld, these areas featuresymbol encounters. Each of the six areas contain at least one large Hideaway (known as Caverns), and multiple, smaller Hideaways (known as Caves) scattered throughout the map. Various hideaways - particularly larger areas - include items for Trainers to discover.

Dazzling Cave	Fountainspring Cave	Grassland Cave	Icy Cave
Riverbank Cave	Rocky Cave	Sandsear Cave	Spacious Cave
Swampy Cave	Volcanic Cave	Whiteout Cave

Big Bluff Cavern	Bogsunk Cavern	Glacial Cavern	Stargleam Cavern
Still-Water Cavern	Sunlit Cavern	Typhlo Cavern

After the player fulfills the following objectives during their adventure, another group of Pokémon are added to the pool of possible encounters, with some requiringSurf in order to access:

• ObtainingTM96 (Strength)
• ObtainingTM97 (Defog)
• Earning theIcicle Badge
• ObtainingTM99 (Waterfall)
• Obtaining theNational Pokédex

With each additional badge earned by the player, the levels of wild Pokémon are increased.

Additionally, all Pokémon in the Hideaways will have at least oneEgg Move if applicable, unlocking some Egg Moves that would otherwise be unobtainable, e.g.Aura Sphere forSquirtle.

Item appearances

When mining, there is a chance for an item to be found in a bulging wall. Some items have requirements to appear, such as Mysterious Shards, only found after obtaining the National Pokedex and fossils of Pokémon not native to Sinnoh, which can only be found after defeating or capturingDialga^BD orPalkia^SP.

Red Shard	Blue Shard	Green Shard	Yellow Shard
Helix Fossil	Dome Fossil	Old Amber	Root Fossil
Claw Fossil	Armor Fossil	Skull Fossil	Rare Bone
Star Piece	Revive	Max Revive	Iron Ball
Heart Scale	Light Clay	Odd Keystone	Hard Stone
Fire Stone	Water Stone	Thunder Stone	Leaf Stone
Moon Stone	Sun Stone	Oval Stone	Everstone
Smooth Rock	Heat Rock	Icy Rock	Damp Rock
Draco Plate	Dread Plate	Earth Plate	Fist Plate
Flame Plate	Icicle Plate	Insect Plate	Iron Plate
Meadow Plate	Mind Plate	Sky Plate	Splash Plate
Spooky Plate	Stone Plate	Toxic Plate	Zap Plate
Pixie Plate	Mysterious Shard S	Mysterious Shard L

Pokémon Statues

Much like Spheres and Fossils, Stone Boxes associated with each Pokémontype can be found by digging. There are two kinds, the commonly seenPretty Stone Boxes and the rarerGorgeous Stone Boxes, which give the playerStandard Statues andColor Statues respectively.

When placed in a player's Secret Base, the chance of seeing a Pokémon of the corresponding type in Hideaways increases. Only the type with the greatest number of statues of the corresponding type will have a boosted effect, which is indicated by the color of the orb placed next to the entrance of the player's base. This "Statue Effect" is increased for every statue of that type that is placed in the player's Secret Base. If the Pokémon has two types, the primary type of the Pokémon has a greater effect than its secondary type in determining which type has a boosted effect. Hence, if only one statue of a dual-typed Pokémon is placed, the boosted type will correspond to the Pokémon's primary type. Furthermore, larger statues of any type provide a greater effect. A maximum of 18 statues can be placed at one time.

Catching aLegendary Pokémon inRamanas Park will reward the player with a statue of that Pokémon for their Secret Base. These Statues cannot be found normally whilst digging underground.

A player's chance of finding a Gorgeous Stone Box can be temporarily increased for four minutes by collecting 40Diglett that can be found scattered throughout the Grand Underground. Each Diglett counts as one towards the tally, while encountering aDugtrio counts as three. This count is reset when the player leaves the Grand Underground.

List of Stone Boxes

Stone Box	Normal	Fighting	Flying	Poison	Ground	Rock	Bug	Ghost	Steel
Pretty
Gorgeous
Stone Box	Fire	Water	Grass	Electric	Psychic	Ice	Dragon	Dark	Fairy
Pretty
Gorgeous

Secret Base

Similar toPokémon Diamond, Pearl, andPlatinum, the player is able to create aSecret Base within the Grand Underground using aDigger Drill. However, unlike the previous games, the Secret Base can only be decorated with statues and pedestals to place them on. The size of a Secret Base can be expanded by exchanging spheres with one of the merchants in the Grand Underground. Like in the original, a player can only have a single base at a time.

List of pedestals

Statues can be placed on pedestals. These pedestals can be exchanged from merchants in the Grand Underground. Certain pedestals can also be purchased at theVeilstone Department Store, and also received from theUnderground Man as a reward for completing certain tasks.

Size	Square Pedestal	Round Pedestal	Sturdy Pedestal	Clear Pedestal	Spin Pedestal	Spinback Pedestal	Dawn Pedestal	Night Pedestal	Diamond Pedestal	Pearl Pedestal
XS							—	—	—	—
S		—			—	—	—	—	—	—
M							—	—	—	—
L
XL

Merchants

Spheres can be used to exchange for pedestals and various items, such asTMs. There are three types of merchants in the Grand Underground:

• Small sphere merchants allow the player to purchase additionalDigger Drills, small or medium pedestals, and TMs which change daily.
• Large sphere merchants who offer large or extra large pedestals, and a different set of TMs.
• An item exchange merchant, who will give spheres in exchange for items that can be dug out. Additionally, he can also be paid to expand the player'sSecret Base.

Small sphere merchant

Item	Cost	Days available
Digger Drill	×8 or 10 ×8 or 10 ×8 or 10	Always, after receiving a Digger Drill from theUnderground Man
Red Sphere L	×50 or 55	One random choice each day
Green Sphere L	×50 or 55
Blue Sphere L	×50 or 55
Prism Sphere L	×50 or 55
Pale Sphere L	×50 or 55
Square Pedestal XS	×10 or 15 ×10 or 15 ×10 or 15	Monday, Friday, Sunday
Square Pedestal S	×15 or 20 ×15 or 20 ×15 or 20	Monday, Sunday
Square Pedestal M	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Monday, Saturday, Sunday
Sturdy Pedestal XS	×10 or 15 ×10 or 15 ×10 or 15	Wednesday, Friday, Sunday
Sturdy Pedestal S	×15 or 20 ×15 or 20 ×15 or 20	Wednesday, Sunday
Sturdy Pedestal M	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Wednesday, Saturday, Sunday
Round Pedestal XS	×10 or 15 ×10 or 15 ×10 or 15	Tuesday, Friday, Sunday
Round Pedestal M	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Tuesday, Saturday, Sunday
Clear Pedestal XS	×10 or 15 ×10 or 15 ×10 or 15	Thursday, Friday, Sunday
Clear Pedestal S	×15 or 20 ×15 or 20 ×15 or 20	Thursday, Sunday
Clear Pedestal M	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Thursday, Saturday, Sunday
Spin Pedestal XS	×25 or 30 ×25 or 30 ×25 or 30 ×12 or 15BD/8 or 10SP ×8 or 10BD/12 or 15SP	Monday, Tuesday, Wednesday, Friday, Sunday
Spinback Pedestal XS	×25 or 30 ×25 or 30 ×25 or 30 ×12 or 15BD/8 or 10SP ×8 or 10BD/12 or 15SP	Tuesday, Thursday, Saturday, Sunday
TM01	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP	Random selection of TMs each day
TM03	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM04	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM06	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM08	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM09	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM12	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10/5 or 8SP ×5 or 8BD/8 or 10SP
TM23	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM34	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM41	×10 or 13 ×10 or 13 ×10 or 13 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM45	×10 or 13 ×10 or 13 ×10 or 13 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM46	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM47	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM48	×10 or 13 ×10 or 13 ×10 or 13 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM49	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM55	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM56	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM57	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM60	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM61	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM62	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM63	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM65	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM66	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM67	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM69	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM72	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM73	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM76	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM77	×10 or 13 ×10 or 13 ×10 or 13 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM81	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM82	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM85	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM86	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM87	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM88	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM91	×20 or 22 ×20 or 22 ×20 or 22 ×13 or 15BD/10 or 13SP ×10 or 13BD/13 or 15SP
TM92	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM93	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM94	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM96	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM97	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM98	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM100	×15 or 18 ×15 or 18 ×15 or 18 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP

Large sphere merchant

Item	Cost	Days available
Red Sphere S×40	×2 or 3	One random choice each day
Green Sphere S×40	×2 or 3
Blue Sphere S×40	×2 or 3
Prism Sphere S×40	×2 or 3
Pale Sphere S×40	×2 or 3
Square Pedestal L	×10 or 15 ×10 or 15 ×10 or 15 ×5 or 7BD/3 or 5SP ×3 or 5BD/5 or 7SP	Monday, Friday, Sunday
Square Pedestal XL	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Monday, Saturday, Sunday
Sturdy Pedestal L	×10 or 15 ×10 or 15 ×10 or 15 ×5 or 7BD/3 or 5SP ×3 or 5BD/5 or 7SP	Wednesday, Friday, Sunday
Sturdy Pedestal XL	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Wednesday, Saturday, Sunday
Round Pedestal L	×10 or 15 ×10 or 15 ×10 or 15 ×5 or 7BD/3 or 5SP ×3 or 5BD/5 or 7SP	Tuesday, Friday, Sunday
Round Pedestal XL	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Tuesday, Saturday, Sunday
Clear Pedestal L	×10 or 15 ×10 or 15 ×10 or 15 ×5 or 7BD/3 or 5SP ×3 or 5BD/5 or 7SP	Thursday, Friday, Sunday
Clear Pedestal XL	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Thursday, Saturday, Sunday
Spin Pedestal M	×15 or 20 ×15 or 20 ×15 or 20 ×8 or 10BD/5 or 7SP ×5 or 7BD/8 or 10SP	Monday, Wednesday, Sunday
Spin Pedestal L	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Monday, Wednesday, Sunday
Spin Pedestal XL	×40 or 50 ×40 or 50 ×40 or 50 ×20 or 25BD/13 or 16SP ×13 or 16BD/20 or 25SP	Monday, Wednesday, Friday, Sunday
Spinback Pedestal M	×15 or 20 ×15 or 20 ×15 or 20 ×8 or 10BD/5 or 7SP ×5 or 7BD/8 or 10SP	Tuesday, Thursday, Sunday
Spinback Pedestal L	×20 or 25 ×20 or 25 ×20 or 25 ×10 or 12BD/7 or 9SP ×7 or 9BD/10 or 12SP	Tuesday, Thursday, Sunday
Spinback Pedestal XL	×40 or 50 ×40 or 50 ×40 or 50 ×20 or 25BD/13 or 16SP ×13 or 16BD/20 or 25SP	Tuesday, Thursday, Saturday, Sunday
Night Pedestal L	×20 or 25BD/13 or 16SP ×13 or 16BD/20 or 25SP	Tuesday, Sunday
Night Pedestal XL	×25 or 30BD/16 or 20SP ×16 or 20BD/25 or 30SP	Thursday, Sunday
Dawn Pedestal L	×20 or 25BD/13 or 16SP ×13 or 16BD/20 or 25SP	Monday, Sunday
Dawn Pedestal XL	×25 or 30BD/16 or 20SP ×16 or 20BD/25 or 30SP	Wednesday, Sunday
Diamond Pedestal L	×25 or 30BD/16 or 20SP ×16 or 20BD/25 or 30SP	Monday, Friday, Sunday
Diamond Pedestal XL	×30 or 35BD/20-23SP ×20-23BD/30 or 35SP	Wednesday, Saturday, Sunday
Pearl Pedestal L	×25 or 30BD/16 or 20SP ×16 or 20BD/25 or 30SP	Tuesday, Friday, Sunday
Pearl Pedestal XL	×30 or 35BD/20-23SP ×20-23BD/30 or 35SP	Thursday, Saturday, Sunday
TM02	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP	Random selection of TMs each day
TM05	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM19	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM26	×13 or 15 ×13 or 15 ×13 or 15 ×10 or 12BD/8 or 10SP ×8 or 10BD/10 or 12SP
TM30	×10 or 12 ×10 or 12 ×10 or 12 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM31	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM36	×10 or 12 ×10 or 12 ×10 or 12 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM39	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM40	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM42	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM43	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM50	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM51	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM53	×10 or 12 ×10 or 12 ×10 or 12 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM59	×10 or 12 ×10 or 12 ×10 or 12 ×8 or 10BD/5 or 8SP ×5 or 8BD/8 or 10SP
TM64	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM71	×13 or 15 ×13 or 15 ×13 or 15 ×10 or 12BD/8 or 10SP ×8 or 10BD/10 or 12SP
TM78	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM79	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM80	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM84	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM95	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP
TM99	×8 or 10 ×8 or 10 ×8 or 10 ×5 or 8BD/3 or 5SP ×3 or 5BD/5 or 8SP

Secret base expansion

Number of spheres required	Expansion
×60 ×60 ×60 ×30 ×30	Increases size of Secret Base to 14×8 tiles
×40 ×40 ×40 ×20 ×20	Increases size of Secret Base to 14×10 tiles

Artwork

Key artwork ofLucas andDawn in the Grand Underground from Brilliant Diamond and Shining Pearl

Trivia

• Despite the change in its layout, the Grand Underground maintainsrotational symmetry, similar to theUnderground.

In other languages

Pokémon Hideaway

Related articles

Grand Underground Hideaways inPokémon Brilliant Diamond and Shining Pearl
Caves
Dazzling Cave •Fountainspring Cave •Grassland Cave •Icy Cave Riverbank Cave •Rocky Cave •Sandsear Cave •Spacious Cave Swampy Cave •Volcanic Cave •Whiteout Cave
Caverns
Big Bluff Cavern •Bogsunk Cavern •Glacial Cavern •Stargleam Cavern Still-Water Cavern •Sunlit Cavern •Typhlo Cavern

Sinnoh
Settlements Twinleaf Town •Sandgem Town •Jubilife City •Oreburgh City •Floaroma Town •Eterna City •Hearthome City Solaceon Town •Veilstone City •Pastoria City •Celestic Town •Canalave City •Snowpoint City •Sunyshore City Pokémon League •Fight Area •Survival Area •Resort Area Routes 201 •202 •203 •204 •205 •206 •207 •208 •209 •210 •211 •212 •213 •214 •215 216 •217 •218 •219 •220 •221 •222 •223 •224 •225 •226 •227 •228 •229 •230 Landmarks Lake Verity (Lakefront) •Oreburgh Gate •Oreburgh Mine •Oreburgh Mining Museum Global Terminal/Global Wonder Station •Ravaged Path •Floaroma Meadow •Valley Windworks •Eterna Forest Old Chateau •Underground/Grand Underground •Wayward Cave •Mount Coronet •Amity Square •Lost Tower Hallowed Tower •Solaceon Ruins •Maniac Tunnel •Lake Valor (Lakefront) •Great Marsh •Pokémon Mansion Trophy Garden •Fuego Ironworks •Iron Island •Lake Acuity (Lakefront) •Spear Pillar •Victory Road Pal Park/Ramanas Park •Contest Hall •Battle Zone •Battle Park •Battle Tower/Battle Frontier •Stark Mountain Snowpoint Temple •Spring Path •Sendoff Spring •Turnback Cave •Fullmoon Island Newmoon Island •Seabreak Path •Flower Paradise •Hall of Origin Access to Distortion World See also Hisui

This article is part ofProject Locations, aBulbapedia project that aims to write comprehensive articles on every location in the Pokémon world.

• Locations
• Sinnoh locations
• Decorations
• Brilliant Diamond and Shining Pearl locations
• Caves