In Pokémon Red, the Old Amber fossil is given to the scientist at the Pokémon Lab in Cinnabar Island either before or after beating the gym leader, Blaine. The scientist revives the Old Amber and gives the player a level 30 Aerodactyl. Professor Oak does not interact with the Old Amber.
A scientist in the back of the Pewter City museum gives out the Old Amber after the player learns the ability called Cut. In addition to obtaining Aerodactyl from the Old Amber, it is possible to revive an Omanyte from the Helix fossil and a Kabuto from the Dome fossil in Pokémon Red, Blue and Yellow. However, the player is only able to choose one of these two fossils when they're offered in Mt. Moon. Another character takes the other one.
Aerodactyl is dual rock- and flying-type Pokémon that does not evolve into any other Pokémon. The only other rock- and flying-type Pokémon in the entire franchise is Archen and its evolved form Archeops.
Archen is also revived from a fossil, and it first became available in the fifth generation of games. In the sixth generation of the Pokémon franchise, Aerodactyl gained a temporary mega evolution that activates when the player equips the item Aerodactylite to Aerodactyl.