There are several fossils out there, but the weakest by far are kabutops, omastar, and armaldo. The best in my opinion is probably bastiodon because of his great defense, and rampardos for his huge attack skill.
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Make sure you have put the fossil in you bag. Press Y and select treasures select the fossil and select put into bag. Then you will be able to exchange it for a Pokemon.
the mine museum in oreburgh city
you revive them in the town of oreburgh in the scientist's building
Darkrai.
You only get one fossil in platinum but you can get it over and over again. It is a skull fossil witch is a Craniados.You are so wrong! I also found claw fossil (anorith) and my friend found a armor fossil (shieldon)you are so wrong,i found a floor fossili found a root fossil (lileep), and a shell fossil (omanyte)I found a Helix Fossil (omanyte too) :)I found Old Amber (Aerodactyl) and Dome Fossil (Kabuto) C=Ok, two things are wrong here:1. There is no such thing as a floor fossil, not in platinum, not in anything.2. I've never heard of Shell Fossil, and I'm a Pokemon expert, so either it doesn't exist, or it belongs to some other Pokemon, but Omanyte is ONLY in the Helix fossil.