This is a list of all discoverable treasures that can be dug up in the Grand Underground! Read on for a list of all shards, fossils, their appearance rate, and how many spheres you can trade them for in Pokemon Brilliant Diamond and Shining Pearl (BDSP).

List of Underground Treasures

Spheres

Spheres are the main currency used in the Grand Underground and are traded with Sphere Traders for different items. These include Pedestals, TMs, and even other Spheres!

List of Spheres

Shards

Collect 10 shards of the same color to trade them for a weather effect TM at the shard collector's house in the south side of Route 212. You can also collect Mysterious Shards and use them in Ramanas Park after getting the National Dex and beating the Elite Four.

Treasure	Discovery Rate	Sphere Trade
Blue Shard	Common	Blue Sphere (6-16)
Green Shard	Common	Green Sphere (6-16)
Red Shard	Common	Red Sphere (6-16)
Yellow Shard	Common	Prism Sphere (6-16)
Mysterious Shard	Uncommon	-

Pokemon Fossils

While not a Fossil that you can turn into a Pokemon, the Rare Bone counts toward your tally of discovered Fossils.

Treasure	Discovery Rate
Armor Fossil	Common (Shining Pearl Only)
Skull Fossil	Common (Brilliant Diamond Only)
Helix Fossil	Uncommon (BD) Rare (SP)
Dome Fossil	Rare (BD) Uncommon (SP)
Root Fossil	Rare (BD) Uncommon (SP)
Claw Fossil	Uncommon (BD) Rare (SP)
Old Amber	Rare
Rare Bone	Uncommon

Fossil type depends on version

You can turn Fossils into Pokemon at the museum in Oreburgh City. The Armor Fossil turns into Shieldon, while the Skull Fossil turns into Cranidos. The type of Sinnoh Fossil you'll be able to get will depend on the version of the game, since Shieldon and Cranidos are version exclusive Pokemon.

How to Get and Revive Fossil Pokemon

Evolution Stones

You can find the stones that trigger the evolution of certain Pokemon, as well as the Everstone, which stops evolution. The appearance rate of most of these stones will depend on the version of your game.

Treasure	Discovery Rate	Sphere Trade
Everstone	Common	Pale Sphere (6-16)
Fire Stone	Uncommon (BD) Rare (SP)	Red Sphere (6-16)
Leaf Stone	Rare (BD) Uncommon (SP)	Green Sphere (6-16)
Moon Stone	Rare (BD) Uncommon (SP)	Pale Sphere (6-16)
Sun Stone	Uncommon (BD) Rare (SP)	Red Sphere (6-16)
Thunder Stone	Uncommon (BD) Rare (SP)	Prism Sphere (6-16)
Water Stone	Rare (BD) Uncommon (SP)	Blue Sphere (6-16)

Battle Items

In the Underground, you can find several items that provide various in-battle effects. These items include held items such as Plates and Rocks and healing items like Revives.

Treasure	Discovery Rate	Sphere Trade
Draco Plate	Rare	Red Sphere (6-16)
Dread Plate	Rare	Red Sphere (6-16)
Earth Plate	Rare	Green Sphere (6-16)
Fist Plate	Rare	Prism Sphere (6-16)
Flame Plate	Rare	Red Sphere (6-16)
Insect Plate	Rare	Green Sphere (6-16)
Icicle Plate	Rare	Blue Sphere (6-16)
Iron Plate	Rare	Prism Sphere (6-16)
Meadow Plate	Rare	Green Sphere (6-16)
Mind Plate	Rare	Pale Sphere (6-16)
Sky Plate	Rare	Blue Sphere (6-16)
Splash Plate	Rare	Blue Sphere (6-16)
Spooky Plate	Rare	Pale Sphere (6-16)
Stone Plate	Rare	Prism Sphere (6-16)
Toxic Plate	Rare	Pale Sphere (6-16)
Zap Plate	Rare	Prism Sphere (6-16)
Max Revive	Uncommon	Pale Sphere (6-16)
Revive	Uncommon	Pale Sphere (6-16)
Heat Rock	Common (BD) Uncommon (SP)	Red Sphere (6-16)
Icy Rock	Common (BD) Uncommon (SP)	Pale Sphere (6-16)
Smooth Rock	Uncommon (BD) Common (SP)	Prism Sphere (6-16)
Damp Rock	Uncommon (BD) Common (SP)	Blue Sphere (6-16)
Hard Stone	Common	Red Sphere (6-16)
Iron Ball	Uncommon	Prism Sphere (6-16)
Light Clay	Uncommon	Pale Sphere (6-16)

Other Rare Treasures

Heart Scales are used to acquire the services of the Move Reminder, while Star Pieces sell for a good amount to help you get money fast. The Odd Keystone is needed to capture Spiritomb.

Treasure	Discovery Rate	Sphere Trade
Heart Scale	Common	Red Sphere (6-16)
Star Piece	Uncommon	Pale Sphere (6-16)
Odd Keystone	Uncommon	-

Pokemon BDSP Related Guides

Grand Underground Features

Grand Underground Guides

Grand Underground Pokemon Locations

Hideaways and List of Pokemon
Fountainspring Cave	Stargleam Cavern (Various types)	Dazzling Cave (Various types)
Grassland Cave	Spacious Cave (Various types)	Big Bluff Cavern
Riverbank Cave (Various types)	Volcanic Cave	Sandsear Cave
Rocky Cave	Bogsunk Cavern	Still-Water Cavern
Whiteout Cave	Icy Cave	Glacial Cavern
Swampy Cave	Typhlo Cavern	Sunlit Cavern (Various types)

All Grand Underground Pokemon Locations