PokéBase - Pokémon Q&A
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You can't find it directly, but in some mirage caves, if you use rock smash on some rocks, there is a chance you can find an Old Amber fossil which can be restored to an Aerodactyl at the 2nd floor at the Devon Corporation in Rustboro City.

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Not just Caves.  Any Rock Smash rock on any Mirage Spot has a chance of producing a Fossil, including Old Amber for Aerodactyl.