Like in most Pokemon game, D/P has some fossils that can be turned into Pokemon! But in D/P, there are different ways to get them then in past generations!
In past generations, you found fossils somewhere the gave them to a scientist and it came to life, and you also could only 1 or 2. In these games, you can get a lot more then just 1.
When you go to the Underground and you dig at the Wall you might find a fossil. In Pearl you will find the Armor Fossil and in Diamond you will find the Skull fossil. And After you get National Dex, you can get all of the Fossils from past generations (Dome, Helix, Old Amber, Claw and Root fossils).
Once you have got the fossil, you can now head to Oreburgh City and in a big Museum like building, is the guy that will revive your fossil. When you revive a fossil it will be at level20.
In this game and unlike others, you can get more then 1 fossil. So you can get like 54 Kabutos if you want.
