You trade it with a girl on route 14 in crystal for a chansey, which can also be found in route 14
Chat with our AI personalities
If you can trade Pokemon from crystal version to gold version my guess is yes
No, Aerodactyl can not learn any rock type moves until Gold/Silver/Crystal.
In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.
You take it to the Pokemon Lab on Cinnabar Island, a scientist there will make it into a Aerodactyl.
In Goldenrod city, but only in the Japenese version of Pokemon Crystal.