The Old Amber (Japanese: ひみつのコハクSecret Amber) is a Fossil which can be regenerated into Aerodactyl.
The Old Amber is different from the other Fossils, being a type of fossilized substance rather than a Fossil named by its appearance; however, the Aerodactyl skeleton in Pewter City Museum implies that it does have its own fossilized remains.
Related cards Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.
Amber is fossilized tree resin commonly found with insects trapped inside of it. The Old Amber is based on the theory of extracting DNA from the blood still preserved inside the insect to bring back past lifeforms. In real life, however, amber cannot preserve DNA.
It is the only Pokémon Fossil that does not have an alternative choice to form a pair.
The mosquito seen in the first generation artwork is a rare case of a real life animal in the Pokémon world.