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The Sinnoh Underground

Lucas and Dawn in the underground of Sinnoh.

The 'Sinnoh Underground' (Japanese: ちかつうろ Chikatsu Uro, literally meaning; "Underground Passage") is an underground area introduced in the Pokémon Diamond Version, Pokémon Pearl Version and Pokémon Platinum Version. It contains to be an underground area of the Sinnoh region which the player need the Explorer Kit which you can get it from the Underground Man in Eterna City to gain access to the underground. The underground of the Sinnoh region has a lot of fun of discovering items that can't not easily found in the Sinnoh region which exploring in the underground can be compared of being an archaeologist searching for hidden treasures. Luckily, you have to move more with the touch screen instead of pressing the button on the Nintendo DS system. You can create a hidden base and decorate your hideout with different kinds of decorations you obtain.

Basics

Underground-merchant-locations

The locations of the treasures.

Once entering the Sinnoh underground you can use the buttons to move anywhere around the place. On the top screen of the DS, there will be shining stars seen which gives away a hint that there is a treasure hidden. The player must go to the location where you can tap with your stylus pen once or maybe twice to act like a radar which sees the hidden treasures where you must dig to get them. There are also treasures hidden under the ground but not only that, there are also traps hidden in the underground where you must be careful. Furthermore, there are a lot of sphere's hidden in the underground which the player can trade them for traps or decorations.

Test of the Underground Man

Once you've obtained the Explorer Kit, the Underground Man directly asks you to do a test which you can agree on it or not. If you agree to his tests that he gives you what you must do for him in the Sinnoh Underground and complete one of them, he will give you a reward. The Underground give you these tests and items:

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

Digg

Digging treasures.

Fossil Dig is a main activity in the Sinnoh Underground. You can find various of valuable items while searching for fossils. Those items cannot be easily found around the Sinnoh Region while you're not in the Sinnoh Underground. After you've tapped on the wall you can dig out various of treasures. You have two tools to dig out items out of the walls. Those two items are: a Hammer and a pickaxe. Those two items have different level of power which can affect the stability wall to crumble. If you are using the hammer it can let you dig large areas very quickly, but it there is also a catch by using it which it clefts the wall quickly. The pickaxe can let you work at small areas very carefully, but it only increase the cleft in the wall a bit on each time. Each time while you are digging using one of the two items, the cleft meter will let you know how big the cleft actually 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 to something valuable:

  • Spheres — You can give your spheres to one of the three traders in the underground which they will give you a valuable item in return. Those items can be used in your secret base that you have created in the Sinnoh Underground.
  • Fossils — Bring your fossils to the Oreburgh Mining Museum which they will restore the fossil into a Pokémon which depends on the fossil that you've found.
  • Shards — If you have collected 10 shards of the same color you can bring them to a lady the lives on Route 212. She can give you a TM in exchange which are:

Be sure that after you've found an item in the underground that you will put them in the bag before you are leaving the underground. You cannot take your items that you've found in the underground back to the surface without putting them in the bag.

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

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