You dig for it under ground after you get the national pokedex and the are rare.
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The Pokemon Aerodactyl can be obtained from the Old Amber. You can find the Old Amber from the Underground. Take it to the Mining Museum in Oreburgh City to obtain Aerodactyl.
You can get it by revive the old amber which can be found underground after the national dex
you have to dig in the under ground. better chances of finding it after national dex
I heard you can find it in the undergound digging, but its rare
The old amber is the fossil of aerodactel go to cinnibar island to ressurect him/her