You Have to Use the Explorer Kit Given by an Old man Living Next door to the pokemon Centre and Go underground and search for fossils. The Places where you see sparkles on the wall may give you fossils i you go and press A on them.
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 find Gligar in Pokemon Platinum at Route 206. You can't FIND IT IN PEARL.
there is no such thing as a hippopotamus in pearl I think the question was supposed to be: "How do you get Hippopotas in Pokemon Pearl?" The answer is: You find it in Maniac Tunnel.
You can get a Houndour in Pokemon Pearl by breeding it from a Houndoom, which you can find on route 214 and 215.
You can not find them you can only train them to 50.
there is no fossils of squrtle in any game
Dig Underground
only the underground.
you can find Shieldon by digging fossils so no he is not exictint, and its only on pearl
go under ground and find fossils
No, you can only find them. You can dig for them in Diamond and Pearl however.
fossils are found under ground
in the underground
You can dig up fossils underground by using the Explorer Kit in the Key items pocket of your bag :)
Oreburgh Town
by digging them from underground
go to: http://www.anime.com/PokeMon/