Grand Underground

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

The Grand Underground (Japanese: 地下大洞窟 Grand Underground Cave) is an area in Pokémon Brilliant Diamond and Shining Pearl found beneath the entire Sinnoh region. Players can travel to the Grand Underground using an Explorer Kit, given to the player by the Underground Man in Eterna City.

It takes the place of the Underground from Pokémon Diamond, Pearl, and Platinum.

Changes from Diamond and Pearl

The digging mini-game

• 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 the version 1.1.0 update, after the Sinnoh Pokédex is completed, Mysterious Shard S and Mysterious Shard L will start appearing in the underground for use in Ramanas Park.
• Secret Bases return and are created using a Digger Drill as before.
  • Bases can only be decorated with statues and pedestals to place them on.
  • The flag stealing mechanic has been removed.
• Goods and Traps, 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 as Hikers) 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 a Pokémon 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 towards Egg distance as well as the step counter app.
• Diglett and Dugtrio 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 a Shiny 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 where wild Pokémon can be encountered. Unlike the main overworld, these areas feature symbol 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 requiring Surf in order to access:

• Obtaining TM96 (Strength)
• Obtaining TM97 (Defog)
• Earning the Icicle Badge
• Obtaining TM99 (Waterfall)
• Obtaining the National Pokédex

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

Progression	Level Ranges
1 Badge	16-20
2 Badges	25-29
3 Badges	29-33
4 Badges	33-37
5 Badges	36-40
6 Badges	39-43
7 Badges	42-46
8 Badges	50-55
Elite Four defeated	58-63

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

Item appearances

When mining, there is a chance for an item to be found in a bulging wall. Some items, such as Mysterious Shards and fossils of Pokémon not native to Sinnoh, can only be found after obtaining the National Pokédex.

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 Pokémon type can be found by digging. There are two kinds, the commonly seen Pretty Stone Boxes and the rarer Gorgeous Stone Boxes, which give the player Standard Statues and Color 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 a Legendary Pokémon in Ramanas 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 40 Diglett that can be found scattered throughout the Grand Underground. Each Diglett counts as one towards the tally, while encountering a Dugtrio 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

Secret Base with Standard and Color statues

Similar to Pokémon Diamond, Pearl, and Platinum, the player is able to create a Secret Base within the Grand Underground using a Digger 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 the Veilstone Department Store, and also received from the Underground 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 as TMs. There are three types of merchants in the Grand Underground:

• Small sphere merchants allow the player to purchase additional Digger 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's Secret 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 the Underground 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 of Lucas and Dawn in the Grand Underground from Brilliant Diamond and Shining Pearl

Trivia

• Despite the change in its layout, the Grand Underground maintains rotational symmetry, similar to the Underground.

In other languages

Language Title Chinese Cantonese 地下大洞窟 Deihhah Daaihduhngfāt Mandarin 地下大洞窟 Dìxià Dàdòngkū French Grands Souterrains German Untergrundhöhlen Italian Grandi Sotterranei Korean 지하대동굴 Jiha Daedonggul Russian Великое подземелье Velikoye podzemel'ye Spanish Grutas del Subsuelo

Pokémon Hideaway

Language Title Chinese Cantonese 寶可夢秘巢 Pokémon Beichàauh Mandarin 寶可夢秘巢 / 宝可梦秘巢 Pokémon Mìcháo French Cachette de Pokémon German Pokémon-Unterschlupf Italian Rifugio di Pokémon Korean 포켓몬 은신처 Pokémon Eunsincheo Russian Укрытие Покемонов Ukrytiye Pokémonov Spanish Guarida Pokémon

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 of Project Locations, a Bulbapedia project that aims to write comprehensive articles on every location in the Pokémon world.