Pokémon Diamond and Pearl/The Underground

The underground contains similar aspects of Spectrobes in it. This is because you can scan the ground with your Stylus, and you can locate sparkles on the ground. If they are in a wall, you can dig them up and exavate colored orbs. Orbs come in several different colors; red, blue, green, and yellow. There are also treasures such as Prism Spheres or rare Diamond and Pearl Items, such as Moon Stones, Thunderstones, and Heart Scales. If the sparkle is just on the ground, to not step on it as it is a trap. Instead, go to the square in front of it and press. You will disengage the trap and you can set it wherever you wish.

You also have a radar on the top screen that tells you where hidden objects are. They appear all the time as little sparkles on the radar.

You can also make Secret Bases in the Underground, which are very similar to those from Pokémon Ruby and Pokémon Sapphire. Unlike Ruby and Sapphire, however, you must obtain a Digger Drill from the Underground Man or trade for one in the Underground. Once you do this, go to "Traps" and use your Drill on a wall space. Once you do this, the Drill will break, and if you want to move your Base you'll have to aquire a new one.

You can also decorate your Secret Base. You can put up to 16 items at a time in your Base, and if you want different ones you'll have to switch out a few items. You can get decorations from three different places: the Underground Man, the Veilstone Department Store, or the Battle Tower. The Underground Man gives you a few basic items once you create a first Secret Base with the Digger Drill he gives you. You can buy unlimited copies of decorations from the Veilstone Department Store, and You can get trophies for beating certain amounts of trainers in a row at the Battle Tower.