If Pearl, dig for some Old Amber underground with the explorer kit. If any other game, I don't own any others, so I don't know
Uh Aerodactle doesn't evolve..... so happy hunting!
There is Anorith,Aerodactal,Kabuto,Omanite,Lileep, and if your trainer code is odd sheldon and if its even cranidos
I'm not sure if this is all of them but here it goes. aerodactal,kabuto,cranidos,lileep. hope this helps. :) Here's All The Fossils:Cranidos,Rampardos,Shieldon,Bastiodon,Aerodactal,Kabuto,Kabutops,Omynite,Omastar,Lileep,Craydilly,Armalldo,And The First Stage Of Armalldo P.S Sorry About Spellin
You smash a rock in the Ruins of Alph by using Rock Smash and under 1 of them there will be an old amber.
go the this sitehttp://www.serebii.net/pokedex-dp/142.shtmlit tell a lot about pokémon game
I now a lot but I'm only going to name two aerodactal and armaldo Omanyte and Kabuto may be possibilities also.
The old amber (conatins Aerodactyl DNA) can only be obtained by a long boring search all over the Pokemon world. You just go around using rock smash on rocks until you find one in the rubble. It would be easier to find one underground in Pearl/Diamond/platinum and give it to a Pokemon you will trade then just take it from it when you receive it and get it revived at the Pewter Museum/
Im serious i got this without a cheat at all!!! go underground and keep popping up until you get in the middle where theres only about 4 tunnels and dig and you might find some fossils but i forget what the fossil was called anyway the take it put it in your bag and then come to the surface and go to orenburgh and into the coal museum and give the fossil to the second guy behind the counter and give him the fossil then go outside and come back in then talk to the man again and he might give you a regirock or something else like aerodactal or lily something.