in the back but u need a ceat.
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If you go to Pewter city and go up there is a lab next to the Museum. In order to get to it though you need the HM cut. When you go in, talk to everybody until one of the people give you an old amber.
Get the old amber from the Pewter city museum. (Cut down the bush on the right and go in that way) Then go to the lab on cinnabar island and revive it there.
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.
Go to the museum in Pewter City. Beside the museum there's a building, use cut, go inside, talk to the guy standing next to a stand, and he will give it to you.
You can't catch Aerodactyl you have to get its fossil at the Pewter City Museum (it's called Old Amber) then bring that fossil to Cinnabar Island where they'll give you the Aerodactyl.