To get Aerodactyl, you have to have cut, go to the Pewter City Museum and cut the bush blocking the alternate entrance, there in a secret room within the building, you should find Old Amber. Bring the Old Amber to the Cinnabar Island laboratory and they'll give you and Aerodactyl.
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Aerodactyl can only Mega Evolve into Mega Aerodactyl. Permanently, Aerodactyl cannot evolve any further.
Aerodactyl.
Aerodactyl doesnt evolve
The old amber will turn into aerodactyl which is a cool rock-flying type and can help you a lot in gyms and the league
You may want to get an Aerodactyl in Pokémon Pearl version. To do so, you have to revive the old amber item.