Grand Underground

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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, found in Eterna City.

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

Changes from Diamond and Pearl

File:Grand Underground BDSP.png
Lucas and Dawn in the Grand Underground
  • The map now conforms to the shape of the Sinnoh landmass instead of a large square layout. Notably, it excludes Iron Island, Fullmoon Island, and Route 223 onwards.
  • 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.
    • At least two areas include surfable water. These hideaways are the Swampy Cave and the Lakeside Cave.
  • The digging minigame returns following closely to its original incarnation with the exception of digging up Pokémon statues, which come from Stone Boxes. There are at least two kinds of Stone Boxes, the common Pretty Stone Boxes and the rare Gorgeous Stone Boxes. Statues acquired from Pretty Stone Boxes are made of normal stone, while statues from Gorgeous Stone Boxes are made of jade. There is a box for each type.
    • These statues may seemingly depict Shiny Pokémon, due to the Pokémon's names having the shiny symbol next to it. If at least three statues from Gorgeous Stone Boxes are used, the chances of the desired type appearing are even higher.
  • Secret Bases return and are created using a Digger Drill as before. Like in the original, a player can only have a single base at a time.
    • Bases can only be decorated with statues and pedestals to place them on. Adding more of a specific type will slightly increase the chances of that type appearing in hideaways. This "Statue Effect" is indicated by the orb place next to the entrance of the player's base. The flag stealing mechanic has also 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.
  • The radar is now triggered by pressing [R] and searches the area around the player's location.
  • The Grand Underground supports online communications, compared to the original games which only supported local communications.
  • Diglett and Dugtrio will occasionally pop out and leave pink sparkles that give 1 and 3 points respectively. Accumulating 40 of these points causes "something good to happen" which increases the shiny odds for Pokémon in Hideaways to 1/2048 for a period of 4 minutes. Additionally, all Stone Boxes found while digging during the 4 minute bonus period will be Gorgeous Stone Boxes. A whistle is heard when this period begins and once more when it ends. The bonus and progress gauge 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.


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

  • Western
  • Eastern
  • Central
  • Northwestern
  • Northeastern
  • Southwestern
  • Southeastern

Pokémon Hideaways

50px This section is incomplete.
Please feel free to edit this section to add missing information and complete it.
Reason: Missing information on encounters available in Grand Underground.[1]

Pokémon Hideaways (Japanese: ポケモンの Pokémon Hideaway) are new places where wild Pokémon can be encountered. Unlike the main overworld, these areas feature symbol encounters. Each of the seven areas contain at least one large Hideaway, though multiple, smaller Hideaways are scattered throughout the map. Various hideaways - particularly larger areas - include items for Trainers to discover, such as Deep Sea Scale. Some Pokémon available in the game can only be found in Hideaways.

The variety of Pokémon encountered increases at five milestones - obtaining TM97 Defog, obtaining TM96 Strength, earning the Icicle Badge, obtaining TM99 Waterfall, and unlocking the National Pokédex - while each badge earned will increase the strength of the Pokémon. The player does not need to be able to use the TM outside battle in order for more variable Pokémon to appear. All Pokémon in the Hideaways will have at least one Egg Move if applicable, and The Grand Underground also unlocks some Egg Moves that would otherwise be unobtainable, e.g. Aura Sphere for Squirtle.

Hideaway locations include:

  • Spacious Caves
  • Grassland Caves
  • Sunlit Cavern
  • Fountainspring Caves
  • Rocky Caves
  • Big Bluff Cavern
  • Volcanic Caves
  • Swampy Caves
  • Bogsunk Cavern
  • Dazzling Caves
  • Stargleam Cavern
  • Whiteout Caves
  • Icy Caves
  • Glacial Cavern
  • Riverbank Caves
  • Still-Water Cavern
  • Sandsear Caves
  • Typhlo Cavern

Additional Information

  • 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 trade spheres in exchange for items that can be dug out. Additionally, he can also be paid to expand a player's Secret Base.
  • Some Hikers found in the Grand Underground allow the player to rest, acting as a Pokémon Center.
  • If the player runs out of digging spots, more will appear once the player enters and exits a Hideaway.
  • After the Sinnoh Pokedex is completed Mysterious Shards will start appearing in the underground.
    • Small and Large shards can be used at Ramanas Park in order to purchase different slate items.
  • The level of Pokémon available in the Grand Underground varies, depending on the number of Gym Badges the Player received and their progression in the game.
Level ranges
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

In other languages

Language Title
Chinese Cantonese 地下大洞窟 Deihhah Daaihduhngfāt
Mandarin 地下大洞窟 Dìxià Dàdòngkū
20px French Grands Souterrains
20px German Untergrundhöhlen
20px Italian Grandi Sotterranei
20px Korean 지하대동굴 Jiha Daedonggul
20px Russian Великое подземелье Velikoye podzemel'ye
20px 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
20px French Cachette de Pokémon
20px German Pokémon-Unterschlupf
20px Italian Rifugio di Pokémon
20px Korean 포켓몬 은신처 Pokémon Eunsincheo
20px Russian Укрытие Покемонов Ukrytiye Pokémonov
20px Spanish Guarida Pokémon

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Twinleaf TownSandgem TownJubilife CityOreburgh CityFloaroma TownEterna CityHearthome City
Solaceon TownVeilstone CityPastoria CityCelestic TownCanalave CitySnowpoint CitySunyshore City
Pokémon LeagueFight AreaSurvival AreaResort Area
Lake Verity (Lakefront) • Oreburgh GateOreburgh MineOreburgh Mining MuseumGlobal Terminal/Global Wonder Station
Ravaged PathFloaroma MeadowValley WindworksEterna ForestOld ChateauThe Underground/Grand Underground
Wayward CaveMount CoronetAmity SquareLost TowerHallowed TowerSolaceon RuinsManiac TunnelLake Valor (Lakefront)
Great MarshPokémon MansionTrophy GardenFuego IronworksIron IslandLake Acuity (Lakefront) • Spear PillarVictory Road
Pal Park/Ramanas ParkContest HallBattle ZoneBattle ParkBattle Tower/Battle FrontierStark MountainSnowpoint Temple
Spring PathSendoff SpringTurnback CaveFullmoon IslandNewmoon IslandSeabreak PathFlower ParadiseHall of Origin
Access to
Distortion World
See also

80px This article is part of Project Locations, a Bulbapedia project that aims to write comprehensive articles on every location in the Pokémon world.