In the Pewter Museum of Science in a backroom there is a scientist who gives it to you though you will need the HM Cut as there is a tree blocking the path.
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 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.
in eterna city
the old amber reveals aridactul
you take it to the fossil guy in cinnabar and he brings it back to life..... when you get the Pokemon back it is areyaldactl-- (don't know hw to spell lol)
Go underground, keep looking and SURELY you'll find it.
Aerodactyl
An old amber is the fossil if you like for aerodactyl.
You need to go in the underground and find an Old amber or trade it with someone.
Get a old amber and take it to a guy in the museum in Petwer City,
The old amber is the fossil of aerodactel go to cinnibar island to ressurect him/her
Because it old