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Pokemon BDSP Grand Underground Basic Breakdown

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Greetings trainers, one of the most memorable features in the original gen 4 games, the Grand Underground is a hot topic for new and returning gen 4 fans. It is a fun source of co-op play and can be incredibly helpful on one’s journey. This Pokemon BDSP Grand Underground Breakdown will go over all of the features the Underground offers on a basic level.

For a video version of the video, click the link below. 

[Related: Pokemon BDSP Shiny Statues: Chimchar, Turtwig, and Piplup]


How to Access the Underground

Players will not have access to the Underground until they reach Eterna City, so near the beginning of the game. Once they get to Eterna, find the house where the Underground Man’s house is and talk to him. He will give them the Explorer’s Kit and lead them outside where the game will plop them into the Grand Underground. 

In the remakes, players can choose whether to play alone or connect to the internet to play with friends. To connect with friends, players can set a link code and send it to the people they’re specifically trying to invite.


Digging

The most renowned thing that players do in the Underground is digging for materials. By using the R button, players can scan walls to find dig sites marked by sparkles. Once players click on them, they are brought to the site where they are told the number of items present. Players have the choice of using a pick hammer or a mallet.

The difference between the two tools is how much range of impact they have on the wall. The mallet will get rid of more stone than the pickaxe, but players must be careful. There is a time limit as every time players chip away at the wall, the dig site comes closer to collapsing. As the mallet breaks more walls, it eats up more time and when used haphazardly, makes it easier for players to lose out on digging up every item. Items that players can obtain are as follows:

Spheres

Red Sphere s

Blue Sphere s

Green Sphere s

Prism Sphere s

Pale Sphere s

Red Sphere L

Blue Sphere L

Green Sphere L

Prism Sphere L 

Pale Sphere L

Items

Revives

Max Revives

Red Shard

Blue Shard

Yellow Shard

Green Shard

Sun Stone

Moon Stone

Fire Stone

Thunder Stone

Water Stone

Leaf Stone

Oval Stone

Everstone

Odd Keystone

Star Piece

Heart Scale

Root Fossil

Claw Fossil

Helix Fossil

Dome Fossil

Old Amber

Armor Fossil

Skull Fossil

Rare Bone

Light Clay

Iron Ball

Icy Rock

Smooth Rock

Heat Rock

Damp Rock

Mysterious Shard S

Mysterious Shard L

Hard Stone

Arceus Plates

Lastly, players should keep in mind that if playing with another person, they can help each other. 


Diglett Hunting

Next is the newest feature for Sinnoh’s Grand Underground. Throughout the Underground, they will see Diglett and Dugtrio at various points. Each of them leaves behind a certain amount of energy; players get 1 Point for Diglett and 3 points for Dugtrio.

Players share the Diglett point count across the multiplayer lobby, so when one player gets the point, all players currently playing get the point. If players leave or join while a player in the lobby has got Diglett Points, they will also get them, even if they enter late.

If players collect 40 points in one session, then they get a small bonus. For 4 minutes, everyone will have an increased chance of encountering a Shiny Pokémon in the Underground, 1 in 2048 compared to 1 in 4096, and the chances of getting a Gorgeous Box to shoot up as well.


Pokemon Hideaways

One of the most pivotal parts of this Pokemon BDSP Grand Underground Breakdown, Pokemon Hideaways are BDSP’s newest additions to Sinnoh’s Underground. These special environments contain Pokemon, not on the surface, specifically rare spawns from the Platinum dex not seen until the post-game. Here is a list of all the caverns and the Pokemon in them as well as a map of the Grand Underground.

grand underground


Courtesy of: Serebii.net

Spacious Cave

Absol
Aipom
Bibarel
Bidoof
Budew
Buneary
Chingling
Glameow (SP)
Golbat
Graveler
Hoothoot
Houndoom
Kriketot
Lickitung
Luxio
Machoke
Machop
Magnemite
Mantyke
Munchlax
Murkrow (BD)
Pachirisu
Pelipper
Psyduck
Purugly (SP)
Rhyhorn
Shinx
Skuntank (BD)
Stunky (BD)
Swablu
Wingull
Zubat

 

Grassland Cave

Absol
Bibarel
Bidoof
Buneary
Cascoon (SP)
Cherubi
Chingling
Combee
Glameow (SP)
Golbat
Hoothoot
Kricketot
Luxio
Machoke
Machop
Munchlax
Murkrow (BD)
Pinsir (SP)
Purugly (SP)
Roselia
Scyther (BD)
Shinx
Silcoon (BD)
Skuntank (BD)
Stunky (BD)
Wurmple
Zubat

 

Fountainspring Cave

Barboach
Bibarel
Bidoof
Buizel
Gabite
Gastrodon
Gible
Hoothoot
Lickitung
Mantyke
Octillery
Pelipper
Psyduck
Quagsire
Ralts
Shellos
Swablu
Tentacool
Tentacruel
Togepi
Whiscash
Wingull
Wooper

 

Rocky Cave

Bronzor
Geodude
Gligar (BD)
Graveler
Hippopotas
Onix
Rhyhorn
Skorupi
Teddiursa (SP)

 

Volcanic Cave

Geodude
Graveler
Houndoom
Magby (SP)
Onix
Ponyta
Skorupi

 

Swampy Cave

Barboach
Croagunk
Gligar (BD)
Golbat
Lickitung
Quagsire
Roselia
Skorupi
Swinub
Tentacool
Tentacruel
Whiscash
Wooper
Zubat

 

Dazzling Cave

Absol
Bronzor
Chingling
Duskull
Elekid (BD)
Gastly
Girafarig
Houndoom
Kadabra
Meditite
Misdreavus (SP)
Mr. Mime
Ralts
Smoochum
Togepi

 

Whiteout Cave

Buneary
Elekid (BD)
Glalie
Luxio
Machoke
Machop
Magnemite
Meditite
Mr. Mime
Munchlax
Pachirisu
Shinx
Sneasel
Snorunt
Snover
Swablu
Swinub
Teddiursa (SP)

 

Icy Cave

Bronzor
Buneary
Glalie
Magnemite
Mr. Mime
Smoochum
Sneasel
Snorunt
Snover
Swablu
Swinub

 

Riverbank Cave

Bibarel
Bidoof
Budew
Buizel
Buneary
Cascoon (SP)
Croagunk
Gabite
Gible
Glameow (SP)
Golbat
Hoothoot
Kricketot
Lickitung
Mantyke
Munchlax
Murkrow (BD)
Octillery
Pelipper
Pinsir (SP)
Psyduck
Purugly (SP)
Scyther (BD)
Silcoon (BD)
Skuntank (BD)
Stunky (BD)
Tentacool
Tentacruel
Whiscash
Wingull
Wurmple

 

Sandsear Cave

Hippopotas
Houndoom
Magby (SP)
Onix
Ponyta
Rhyhorn
Skorupi

 

Still-Water Cavern

Barboach
Bibarel
Bidoof
Budew
Buizel
Buneary
Cascoon (SP)
Croagunk
Gabite
Gible
Glameow (SP)
Hoothoot
Kricketot
Lickitung
Mantyke
Munchlax
Murkrow (BD)
Octillery
Pelipper
Pinsir (SP)
Psyduck
Purugly (SP)
Scyther (BD)
Silcoon (BD)
Skuntank (BD)
Stunky (BD)
Tentacool
Tentacruel
Whiscash
Wingull
Wurmple

 

Sunlit Cavern

Bibarel
Bidoof
Buneary
Cascoon (SP)
Cherubi
Combee
Glameow (SP)
Gligar (BD)
Golbat
Hoothoot
Kricketot
Luxio
Machoke
Machop
Munchlax
Murkrow (BD)
Purugly (SP)
Rhyhorn
Roselia
Shinx
Silcoon (BD)
Skuntank (BD)
Stunky (BD)
Teddiursa (SP)
Wurmple
Zubat

 

Big Bluff Cavern

Absol
Bronzor
Geodude
Graveler
Hippopotas
Onix
Pinsir (SP)
Scyther (BD)
Skorupi

 

Stargleam Cavern

Absol
Bronzor
Chingling
Duskull
Elekid (BD)
Gastly
Girafarig
Houndoom
Kadabra
Meditite
Misdreavus (SP)
Mr. Mime
Ralts
Smoochum
Togepi

 

Glacial Cavern

Bronzor
Buneary
Elekid (BD)
Glalie
Magnemite
Mr. Mime
Sneasel
Snorunt
Snover
Swablu
Swinub
Teddiursa (SP)

 

Bogsunk Cavern

Barboach
Croagunk
Gligar (BD)
Golbat
Lickitung
Quagsire
Roselia
Skorupi
Swinub
Tentacool
Tentacruel
Whiscash
Wooper
Zubat

 

Typhlo Cavern

Geodude
Graveler
Houndoom
Magby (SP)
Onix
Ponyta
Rhyhorn
Skorupi

 

Each of these caverns can give players rare Pokemon and can serve as excellent training grounds. However, players might not always get the rare spawns they want; this can be amended by exiting and re-entering the cavern they’re in. Players will also get access to more Pokemon depending on where they are in the game. This is the list of milestones:

Get Strength

Obtain Icicle Badge

Acquire Waterfall

Earn the National Pokédex

Players will get the most Pokemon after unlocking the National Dex.

Players are better off beginning their hideaway escapades when they have access to Dusk Balls as this makes the grind for rare Pokemon exponentially easier. Players can use any pokeballs they want, but Dusk Balls and Ultra Balls will make it less of a chore. Players can also affect the rates of certain spawns by the use of certain statues in their secret bases.


Secret Bases

Players can make secret bases using the Digging Drill. When it is set up, people can visit each other’s bases. They can also move their bases at any time by using another Digging Drill purchased from one of the sellers in the Underground. There is also the ability to expand the base through various Traders, who offer spheres in exchange for standard items. These can also expand secret bases. There are two expansions players can get:

1st Expansion: 60 Red Sphere S, blue sphere S, and green sphere S and 30 Prism and Pale Sphere S’s

2nd Expansion: 40 Red Sphere L , Blue Sphere L, and Green Sphere L’s and 20 Prism and Pale Sphere L’s

The main purpose for secret bases this time around is to decorate them with the statues that affect the spawn rates of certain types of Pokemon. The more statues players have of a certain type of Pokemon, the stronger the effect is for that type. Statues can also be placed on pedestals for a prettier look and potential secondary effects. There are 3 types of statues: Standard, colored, and legendary. Players can get standard statues from pretty boxes, colored from gorgeous, and legendary from catching the Pokemon depicted in the statue from Ramanas Park. The different types of statues will be covered more in-depth in a more specific guide, so be on the lookout for that.


Conclusion

These are the basic things to know about how the Grand Underground works. As players discover more, there will be separate articles to explain each activity in a specific depth.  With the knowledge from this Pokemon BDSP Grand Underground Breakdown, trainers should be able to enjoy their expeditions a lot easier.


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1 comment

Pokemon BDSP Shiny Statues: Chimchar, Turtwig, and Piplup November 29, 2021 at 1:05 pm

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