Platinum Underground, fossils and Secret Bases
Dig for original Sinnoh treasures, revive fossils and progress through Secret Base activities.
Original Nintendo DS release; not Brilliant Diamond or Shining Pearl.
Get the Explorer Kit
Visit the Underground Man in Eterna for the Explorer Kit and his tutorial tasks. Use it outdoors to enter the original local Underground. It has mining, Spheres, traps and Secret Bases; the remake’s wild Pokémon hideaways are absent.
Dig without collapsing the wall
Search the sparkling mining spots, expose treasures with the pickaxe or hammer and watch the wall’s collapse meter. The hammer removes a larger area but consumes more of the wall’s durability. Finish exposing the item before the wall collapses.
Fossils and treasures
Revive fossils at Oreburgh Museum. Skull/Armor Fossil availability follows the save’s Trainer ID parity in Platinum, and additional fossils become available with National Pokédex progress. Stones, Plates, Heart Scales and Shards support other collection and training plans.
Bases and flags
Use a Digger Drill to create a Secret Base, decorate it and trade Spheres for goods. Original flag captures require another player’s base through local wireless; they progress the base’s rank and remove boulders. Plan these social requirements separately from solo mining.
These references cover the original Nintendo DS Platinum. Check story progress, time of day and special access requirements beside each entry.