I heard you can find it in the undergound digging, but its 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 dig for it under ground after you get the national pokedex and the are rare.
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
The only way to catch Aerodactyl in Pokémon Platinum is by going underground, digging for an Old Amber and grabbing it and then taking it to the Museum in Oreburgh City so a person there can restore it into an Aerodactyl.