After you beat Cynthia, and get the National Dex, go to the Underground, and keep digging until you find an item called Old Amber. Go to the man with the glasses and coat and he'll revive your Aerodactyl.
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you have to go underground and dig for him
Aerodactyl does not evolve lolk?
Aerodactyl does not evolve.
No
you have to find an old amber underground which are very rare and take it to the fossil museum in oreburg city hope it helps XD