You don't, you have to trade Aerodactyl from FRLG
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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.
The old amber is the fossil of aerodactel go to cinnibar island to ressurect him/her
You take the Old Amber to Cinnabar Island and give it to the scientists. They do research on on extinct Pokemon and bring them back to life, you will receive Aerodactyl.
Aerodactyl comes from the old amber you need to revive it on seafoam islands on Pokemon leaf green and fire red , the coal museum in oreburgh on diamond and pearl. hope this helps!
the old chateu is only in Pokemon diamond pearl and platinum versions