The Grand Underground

The Grand Underground is an evolution of the Underground feature from Pokémon Diamnod & Pearl. It has been expanded to a larger area, segmented into 6 different areas which are accessed through various points in Sinnoh, based on your geography. It is accessed by the Explorer Kit that you receive in Eterna City. He will then give you various tasks to get items
Use Explorer Kit - Red Sphere S, Blue Sphere S, Green Sphere S
Dig an object - Digger Drill
Make a Secret Base - 5 Quick Ball, 5 Dusk Ball, 5 Dive Ball
Decorate a Secret Base - 1 Square Pedestal XS
Dig in a wall started by another player - Clear Pedestal L

Like previously, you can interact with other players locally, but now with the online feature and also on your own. However, there are numerous changes.

Access Map
Picture	Access Location	Areas
	Celestic Town	Dazzling Cave Icy Cave Stargleam Cavern
	Snowpoint City & Adjoining Routes/Full Moon Island	Whiteout Cave Icy Cave Dazzling Cave Spacious Cave Glacial Cavern
	Battle Zone	Volcanic Cave Dazzling Cave Sandsear Cave Grassland Cave Fountainspring Cave Spacious Cave Rocky Cave Typhlo Cavern
	Ramanas Park/Twinleaf Town/Canalave City & Adjoining Routes	Spacious Cave Grassland Cave Fountainspring Cave Swampy Cave Riverbank Cave Sunlit Cavern
	Sunyshore City & South east of Route 213	Spacious Cave Rocky Cave Fountainspring Cave Swampy Cave Sandsear Cave Bogsunk Cavern
	Everywhere else	Spacious Cave Grassland Cave Fountainspring Cave Rocky Cave Swampy Cave Riverbank Cave Volcanic Cave Sandsear Cave Dazzling Cave Still-Water Cavern Big Bluff Cavern

Multiplayer

The Grand Underground can be played Locally or Online with other players. With this, you can participate in Digs together, see eachother and utilise eachother's Secret Base bonus. If a player starts to dig, other players can join the dig.

Anchors

Digging & Items

Statues

Pokémon Hideaways

Diglett Hunting

A new feature implemented into the Grand Underground is the Diglett feature. Throughout the Underground, you will see various Diglett and Dugtrio at junctions and corners. They will retreat before you can get to them but will leave some Glossy Stones; 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 will also get the bonus. 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 you collect 40 points in one session, then you will get a small bonus. For 4 minutes, you will have a slightly increased chance of encountering a Shiny Pokémon in the Underground, 1 in 2048 compared to 1 in 4096, more chance of Rare Spawns, and the chances of getting a Gorgeous Box from digging is higher.

Digging

The digging feature makes a return and is largely unchanged from the original games. When you move through the Underground, there may be spots that can be dug up. These can be seen on the map and by pressing R to activate a radar which gets them to light up.

When in there, the minigame is the same as before. When you enter, it tells you the amount of items you can find in the square. You can use a pickax to knock out one square and a hammer to knock out more, but doing more damage to the wall. The grey rocks require more to break through.

If you clear the item, you get to keep it but there are many iron bars throughout the underground. If you hit them, it causes damage to the wall so avoid it. When the wall has received a maximum amount of damage, you will be removed and gain the items.

If you play in multiplayer, other players can join your dig. Whenever a player joins another person's dig, they will be able to take parts of your wall away without it damaging yours, so you can get some extra items done through co-ordination.

List of Items found in Underground

Spheres

Spheres can be used with the various traders throughout the Underground to get other items, larger spheres, TMs and more. These traders change their items daily from a random pool of items. Some traders will even expand the size of your Secret Base in exchange for Spheres.

Picture

Name

Description

Rarity

Red Sphere S

A small red sphere that glows like fire.

Beginning	Common
Endgame	Quite Common

Beginning	Very Common
Endgame	Quite Common

Blue Sphere S

A small blue sphere that glistens like ice.

Beginning	Very Common
Endgame	Quite Common

Beginning	Common
Endgame	Quite Common

Green Sphere S

A small green sphere that glows like sunlit leaves.

Beginning	Quite Common
Endgame	Quite Common

Prism Sphere S

A small sphere that's clear enough to see through.

Beginning	Rare
Endgame	Rare

Beginning	Rare
Endgame	Rare

Pale Sphere S

A small sphere that glows in seven colors.

Beginning	Rare
Endgame	Rare

Beginning	Rare
Endgame	Rare

Red Sphere L

A large red sphere that glows like fire.

Beginning	Uncommon
Endgame	Quite Uncommon

Beginning	Uncommon
Endgame	Quite Uncommon

Blue Sphere L

A large blue sphere that glistens like ice.

Beginning	Uncommon
Endgame	Quite Uncommon

Beginning	Uncommon
Endgame	Quite Uncommon

Green Sphere L

A large green sphere that glows like sunlit leaves.

Beginning	Quite Uncommon
Endgame	Quite Uncommon

Prism Sphere L

A large sphere that's clear enough to see through.

Beginning	Rare
Endgame	Rare

Beginning	Rare
Endgame	Very Rare

Pale Sphere L

A large sphere that glows in seven colors.

Beginning	Rare
Endgame	Very Rare

Beginning	Rare
Endgame	Rare

Items

Picture

Name

Description

Rarity

Revive

A medicine that can be used to revive a single Pokémon that has fainted. It also restores half of the Pokémon's max HP.

Beginning	Very Rare
Endgame	Very Rare

Max Revive

A medicine that can be used to revive a single Pokémon that has fainted. It also fully restores the Pokémon's max HP.

Beginning	Extremely Rare
Endgame	Very Rare

Red Shard

A small red shard. It appears to be a fragment of some sort of implement made long ago.

Beginning	Very Rare
Endgame	Rare

Beginning	Rare
Endgame	Rare

Blue Shard

A small blue shard. It appears to be a fragment of some sort of implement made long ago.

Beginning	Rare
Endgame	Rare

Beginning	Very Rare
Endgame	Rare

Yellow Shard

A small yellow shard. It appears to be a fragment of some sort of implement made long ago.

Beginning	Rare
Endgame	Rare

Beginning	Very Rare
Endgame	Rare

Green Shard

A small green shard. It appears to be a fragment of some sort of implement made long ago.

Beginning	Very Rare
Endgame	Rare

Beginning	Rare
Endgame	Rare

Sun Stone

A peculiar stone that can make certain species of Pokémon evolve. It burns as red as the evening sun.

Beginning	Very Rare
Endgame	Rare

Beginning	Extremely Rare
Endgame	Very Rare

Moon Stone

A peculiar stone that can make certain species of Pokémon evolve. It is as black as the night sky.

Beginning	Very Rare
Endgame	Very Rare

Beginning	Very Rare
Endgame	Rare

Fire Stone

A peculiar stone that can make certain species of Pokémon evolve. The stone has a fiery orange heart.

Beginning	Very Rare
Endgame	Rare

Beginning	Extremely Rare
Endgame	Very Rare

Thunder Stone

A peculiar stone that can make certain species of Pokémon evolve. It has a distinct thunderbolt pattern.

Beginning	Very Rare
Endgame	Rare

Beginning	Extremely Rare
Endgame	Very Rare

Water Stone

A peculiar stone that can make certain species of Pokémon evolve. It is the blue of a pool of clear water.

Beginning	Extremely Rare
Endgame	Very Rare

Beginning	Very Rare
Endgame	Rare

Leaf Stone

A peculiar stone that can make certain species of Pokémon evolve. It has an unmistakable leaf pattern.

Beginning	Very Rare
Endgame	Very Rare

Beginning	Very Rare
Endgame	Rare

Oval Stone

A peculiar stone that can make certain species of Pokémon evolve. It's as round as a Pokémon Egg.

Beginning	Unavailable
Endgame	Unavailable

Everstone

An item to be held by a Pokémon. A Pokémon holding this peculiar stone is prevented from evolving.

Beginning	Very Rare
Endgame	Rare

Odd Keystone

A vital item that is needed to keep a stone tower from collapsing. Voices can be heard from it occasionally.

Beginning	Unavailable
Endgame	Very Rare

Star Piece

A small shard of a beautiful gem that gives off a distinctly red sparkle. It can be sold at a high price to shops.

Beginning	Very Rare
Endgame	Very Rare

Heart Scale

A pretty, heart-shaped scale that is extremely rare. Some people are happy to receive one.

Beginning	Quite Uncommon
Endgame	Rare

Root Fossil

A fossil from a prehistoric Pokémon that once lived in the sea. It looks as if it could be part of a plant's root.

Beginning	Unavailable
Endgame	Very Rare

Beginning	Unavailable
Endgame	Rare

Claw Fossil

A fossil from a prehistoric Pokémon that once lived in the sea. It appears to be a fragment of a claw.

Beginning	Unavailable
Endgame	Rare

Beginning	Unavailable
Endgame	Very Rare

Helix Fossil

A fossil from a prehistoric Pokémon that once lived in the sea. It might be a piece of a seashell.

Beginning	Unavailable
Endgame	Rare

Beginning	Unavailable
Endgame	Very Rare

Dome Fossil

A fossil from a prehistoric Pokémon that once lived in the sea. It could be a shell or carapace.

Beginning	Unavailable
Endgame	Extremely Rare

Beginning	Unavailable
Endgame	Rare

Old Amber

A piece of amber that still contains the genetic material of an ancient Pokémon. It's clear with a tawny, reddish tint.

Beginning	Unavailable
Endgame	Very Rare

Armor Fossil

A fossil from a prehistoric Pokémon that once lived on the land. It looks to be from some kind of protective collar.

Beginning	Unavailable
Endgame	Unavailable

Beginning	Rare
Endgame	Rare

Skull Fossil

A fossil from a prehistoric Pokémon that once lived on the land. It appears as though it's part of a head.

Beginning	Rare
Endgame	Rare

Beginning	Unavailable
Endgame	Not Available

Rare Bone

A rare bone that is extremely valuable for the study of Pokémon archeology. It can be sold for a high price to shops.

Beginning	Very Rare
Endgame	Very Rare

Light Clay

An item to be held by a Pokémon. Protective moves like Light Screen and Reflect will be effective longer.

Beginning	Extremely Rare
Endgame	Very Rare

Beginning	Extremely Rare
Endgame	Very Rare

Iron Ball

An item to be held by a Pokémon. It lowers Speed and allows Ground-type moves to hit Flying types and holders that are levitating.

Beginning	Extremely Rare
Endgame	Very Rare

Beginning	Extremely Rare
Endgame	Very Rare

Icy Rock

An item to be held by a Pokémon. It extends the duration of the move Hail when used by the holder.

Beginning	Very Rare
Endgame	Rare

Beginning	Extremely Rare
Endgame	Very Rare

Smooth Rock

An item to be held by a Pokémon. It extends the duration of the move Sandstorm when used by the holder.

Beginning	Extremely Rare
Endgame	Very Rare

Beginning	Very Rare
Endgame	Rare

Heat Rock

An item to be held by a Pokémon. It extends the duration of the move Sunny Day when used by the holder.

Beginning	Very Rare
Endgame	Rare

Beginning	Extremely Rare
Endgame	Very Rare

Damp Rock

An item to be held by a Pokémon. It extends the duration of the move Rain Dance when used by the holder.

Beginning	Extremely Rare
Endgame	Very Rare

Beginning	Very Rare
Endgame	Rare

Mysterious Shard S

A small shard that emanates an enigmatic power. Inside the shard, you can see a pattern that looks like Ramanas roses.

Beginning	Unavailable
Endgame	Rare

Mysterious Shard L

A large shard that emanates an enigmatic power. Inside the shard, you can see a pattern that looks like Ramanas roses.

Beginning	Unavailable
Endgame	Very Rare

Hard Stone

An item to be held by a Pokémon. It's a durable stone that boosts the power of Rock-type moves.

Beginning	Very Rare
Endgame	Rare

Flame Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Fire-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Splash Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Water-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Zap Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Electric-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Meadow Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Grass-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Icicle Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Ice-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Fist Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Fighting-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Toxic Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Poison-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Earth Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Ground-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Sky Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Flying-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Mind Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Psychic-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Insect Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Bug-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Stone Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Rock-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Spooky Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Ghost-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Draco Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Dragon-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Dread Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Dark-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Iron Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Steel-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Pixie Plate

An item to be held by a Pokémon. It's a stone tablet that boosts the power of Fairy-type moves.

Beginning	Extremely Rare
Endgame	Extremely Rare

Pokémon Hideaways
A new feature to this game is the Pokémon Hideaways. There's different biomes in each of the areas of the underground, and you can find wild Pokémon throughout the areas. Many Pokémon are exclusive to these Pokémon hideaways and more Pokémon appear at various points of your progression, with the Post-Dialga/Palkia being the feature that adds the most. Through this, nearly every Pokémon in the Post-Dialga/Palkia to Sinnoh Each Pokémon also has a chance of having one of their Egg Moves when you catch them in the Underground. Whenever you enter one of the Hideaways, there is a small chance of a "Rare Spawn" appearing. Rare Spawns are Pokémon not in the Sinnoh Pokédex and can appear at any time. The Pokémon you find can be manipulated by utilising the Statues in your Secret Base Click here for full details
Secret Bases
Secret Bases make a return in the Grand Underground. Here, you can use the Digging Drill item to create a Secret Base anywhere within the Grand Underground. When it is set up, people can visit your base
Decorating Your Secret Bases
Decorating your Secret Bases is a lot different in this game than in the originals. Rather than using various furniture, the purpose of your Secret Base decoration here is to place various statues. These statues are then used to boost the chances of getting a Pokémon of a specific type, with the type the statue giving being based on the type of the Pokémon it's based on. There's only one boost at a time, and the more of each type you put in, the better the boost. You can have 18 statues up at any one time, and they all need to fit. Statues have got a variety of different sizes based on the Pokémon and, for decoration, you can purchase Pedestals to put them on. The bigger the statue, the more the effect on the wild Pokémon. The Color statues have got double the effect and Legendary statues have triple the effect. Click here for full details