First you need to get the Old Amber (a type of fossil). Then you go to pewter city museum and ask the guy and then he'll make the Aerodactyl for you.
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Electrode is the fastest Pokemon there is followed by Jolteon then Aerodactyl. The fastest 2nd generation Pokemon is Crobat.
Use rock smash on the rocks at the Ruins of Alph and you might find a fossil. You take it to the museum in Kanto and the guy will turn it into a Pokemon
sorry you have to trade it to Pokemon soul silver
Tauros, Aerodactyl, Snorlax, Donphan, Electivire, and Regigigas learn Giga Impact by leveling up.A lot more learn it by TM.
No, Aerodactyl can not learn any rock type moves until Gold/Silver/Crystal.