Sinnoh Underground

Lucas and Dawn in the underground of Sinnoh.

The Sinnoh Underground (Japanese: ちかつうろ, Hepburn: Chikatsu Uro, trans. literally meaning; "Underground Passage") is an underground area introduced in the Pokémon Diamond Version, Pokémon Pearl Version and Pokémon Platinum Version. It is an underground area of the Sinnoh region that the player can access using the Explorer Kit which you can get from the Underground Man in Eterna City. The underground of the Sinnoh region has a lot of fun ways for discovering items that are not easily found in the Sinnoh region. Exploring in the underground can be compared to that of being an archaeologist searching for hidden treasures. You can create a hidden base and decorate it with the various decorations that you might obtain.

Basics

The locations of the treasures.

Upon entering the Sinnoh underground the top screen of the DS will change to a map of the area. Shining stars that appear on the map give away a hint as to where there is a hidden treasure. The player can go to the location where they can tap with their stylus pen to act like a radar which sees the hidden treasures and where you must dig to get them. There are also traps hidden in the underground so one must be careful. Furthermore, there are sphere's hidden in the underground which the player can trade for traps or decorations.

Test of the Underground Man

Once you've obtained the Explorer Kit, the Underground Man asks you to do a test which you can choose whether or not to do. If you agree to his tests that he gives you then you must go into the Sinnoh Underground and complete one of them. Upon completion of one of the tests he will give you a reward. The Underground give you these tests and corresponding rewards:

No.	Missions	Rewards
1	Go to the Underground.	Move Trap (↑), Bubble Trap and Leaf Trap.
2	Dig up an object.	Prism Sphere 1, Red Sphere 1 and Blue Sphere 1.
3	Bury a Sphere.	Digger Drill.
4	Create a Secret Base.	Plain Table, Wooden Chair, Small Bookshelf and Buneary Doll.
5	Decorate the Secret Base.	A doll Based on your Starter Pokémon.
1	Obtained the Bronze Flag.	Pretty Gem.
3	Obtained the Silver Flag.	Shiny Gem.
10	Obtained the Gold Flag.	Mystic Gem.
50	Obtained the Platinum Flag.	Glitter Gem.

Activities

Fossil Dig

Digging treasures.

Fossil Dig is one of the main activities in the Sinnoh Underground. You can find various valuable items while searching for fossils. Those items cannot be easily found around the Sinnoh Region while you're not in the Sinnoh Underground. You have two tools to dig out items out of the walls, a Hammer and a pickaxe. Those two items have different level of power which can affect the stability of the wall and even cause it to crumble. If you are using the hammer it can let you dig large areas very quickly, but it clefts the wall quickly. The pickaxe can let you work on small areas very carefully and it only increases the cleft in the wall a bit with each hit. The cleft meter will let you know how big the cleft is. Once the meter is at the left end of the screen, the wall start to collapse.

Items during Fossil Digging

You can find valuable items that cannot be found around the Sinnoh Region that easily. There are six kinds of items that can be found while digging in the underground: Spheres, Shards, Fossils, Evolution Items, Battle Items and Heart Scales. You can trade three of the six treasures for something valuable:

• Spheres — You can give your spheres to one of the three traders in the underground which in return they will give you a valuable item. Those items can be used in your secret base that you may have created.
• Fossils — Bring your fossils to the Oreburgh Mining Museum where they will restore the fossil into a Pokémon.
• Shards — If you have collected 10 shards of the same colour you can bring them to a lady whom lives on Route 212. She can give you a TM in exchange. Those being:
  • Red Shard — Sunny Day
  • Blue Shard — Rain Dance
  • Green Shard — Hail
  • Yellow Shard — Sandstorm

Be sure that after you've found an item in the underground that you put them in your bag before you are leaving the underground. You cannot take your items that you've found in the underground back to the surface otherwise.

List of Underground Treasures

Name	Trade	Level		Discovery
Armor Fossil	Blue Sphere	30	50	E	B
Blue Shard	Blue Sphere	20	25	B	C
Blue Sphere	—	20	25	A	A
Damp Stone	Blue Sphere	40	50	D	D
Draco Plate	Red Sphere	70	80	D	D
Dread Plate	Red Sphere	70	80	D	D
Earth Plate	Jade Sphere	70	80	D	D
Everstone	Pale Sphere	25	35	D	D
Fire Stone	Red Sphere	70	80	D	D
Fist Plate	Hard Sphere	70	80	D	D
Flame Plate	Red Sphere	70	80	D	D
Green Shard	Jade Sphere	25	35	C	B
Hard Sphere	—	—	—	B	B
Hard Stone	Red Sphere	25	35	D	D
Heart Scale	Red Sphere	5	10	B	B
Heat Stone	Red Sphere	40	50	D	D
Icicle Plate	Blue Sphere	70	80	D	D
Icy Stone	Pale Sphere	35	40	D	D
Insect Plate	Jade Sphere	70	80	D	D
Iron Plate	Hard Sphere	70	80	D	D
Iron Sphere	Hard Sphere	40	50	D	D
Jade Sphere	—	—	—	A	A
Leaf Stone	Jade Sphere	25	35	D	D
Light Clay	Jade Sphere	40	50	D	D
Max Revive	Pale Sphere	40	50	D	D
Meadow Plate	Jade Sphere	70	80	D	D
Mind Plate	Pale Sphere	40	50	D	D
Moon Stone	Pale Sphere	25	35	D	D
Pale Sphere	—	—	—	B	B
Rare Bone	Pale Sphere	25	35	D	D
Red Shard	Red Sphere	20	25	C	B
Revive	Pale Sphere	5	10	C	C
Skull Fossil	Jade Sphere	30	50	B	E
Sky Plate	Blue Sphere	70	80	D	D
Smooth Rock	Hard Sphere	35	40	D	D
Splash Plate	Blue Sphere	70	80	D	D
Spooky Plate	Pale Sphere	70	80	D	D
Star Piece	Pale Sphere	35	45	D	D
Stone Plate	Hard Sphere	70	80	D	D
Sun Stone	Red Sphere	25	35	D	D
Thunderstone	Hard Sphere	25	35	D	D
Toxic Plate	Pale Sphere	70	80	D	D
Water Stone	Blue Sphere	25	35	D	D
Yellow Shard	Hard Sphere	20	25	B	C
Zap Plate	Hard Sphere	70	80	D	D