a good start for looking is to go to oreburgh (or something like that) city and start there, there is a higher chance of getting fossils.
no fossils are found underground when you dig them up then take them to oreburgh city to the musuem and the man at the desk will change it into a pokemon
To put it in better words, you must use the Explorer's Kit to go underground and excavate bumps in the wall for fossils. You can pretty much have an infinite amount of fossils from all generations (except 2 of course). You then put those fossils in your bag and go to Oreburgh City's museum north of the city and talk to the blue haired scientist. Talk to him, choose the fossil, go out of the museum (like he says), go right back in, and there's your Pokémon.
BE SURE TO HAVE SOME SPACE IN YOUR POKÉMON INVENTORY!
Under ground using the explorer kit.
Page blanked due to rudeness
in Oreburgh city in the museum
you can get all the old fossil Pokemon underground after obtaining the national Dex. you can get cranidos only on diamond anytime and shieldon only on pearl anytime underground.
Skull fossils. If you want proof, I honestly think that I have 15 cranidos on diamond.
go into the underground, that's were you will find any fossil Pokemon. except on diamond, you cannot get a shieldon or lileap. those are only found on pearl. then go to the oreburgh museum and give your fossils to the professor and he will revive them!
Beat the Pokemon League, and you will be able to find all but one of the fossils of the ancient Pokemon. (For Diamond, all but Shieldon's fossil are available)
You go underground and just search. Skull fossils appear at random, but they aren't all that rare. You just have to search. Also, Cranidos Skull fossils can only be found in Pokemon diamond, and Sheildon Armor Fossils can only be found in Pokemon pearl.
You can get other fossils when you defeat the Elite Four and the Champion and receive the National Pokedex in Pokemon Diamond.
cheat...................................daa
Page blanked due to rudeness
in Oreburgh city in the museum
Armour,Skull,Helix,Dome,Old Amber and Root Fossils.
you can get all the old fossil Pokemon underground after obtaining the national Dex. you can get cranidos only on diamond anytime and shieldon only on pearl anytime underground.
to find fossils go underground by getting the kit and then you can just find them while digging
A place you where give fossils for Pokemon like Cranidos for the skull fossil.
Skull fossils. If you want proof, I honestly think that I have 15 cranidos on diamond.
Oreburg in the musium just above the pokecenter.