Fossil Pokémon

Fossil Pokémon is a group of seven Pokémon which can be obtained from specific items (Fossils).

All of these Pokémon have quite high values of Defense and Special Defense. They all are of dual -Type, except for Cranidos. They all are obtained at Level 20 and evolve at 30. Any Fossil can be also found in the Underground in 4th Generation games.

1st Generation Fossil Pokémon
These Pokémon can be obtained in Pokémon Red, Blue, Yellow, FireRed, and LeafGreen by handing their fossil over to a scientist in Cinnabar Island's Lab.

Kabuto
Kabuto is a crab-like Water and Rock-Type Pokémon obtained from a Dome Fossil. It evolves into Kabutops

Omanyte
Omanyte's name comes from the Precambrian organism Ammonyte, as this Pokémon is also shaped like it. It can be obtained from a Helix Fossil. Same type as Kabuto. Evolves into Omastar.

Aerodactyl
Aerodactyl is the only Fossil Pokémon that doesn't evolve. It can be obtained from Old Amber it's shaped like a pterodactyl and is (so far the only) Flying-Rock Type Pokémon.

3rd Generation Fossil Pokémon
These Fossils can be found in the desert area east of Lavaridge.

Anorith
Anorith is a Bug-Rock Type, born from Claw Fossil. Evolves into Armaldo.

Lileep
Lileep is Grass-Rock Type and obtained from Root Fossil. Evolves into Cradily.

4th Generation Fossil Pokemon
You can bring these Pokemon back to life at the Oreburgh Museum

Cranidos
Is a Pokemon only found in Pokemon Diamond and in Pokemon Platinum if the last digit of your trainer ID is an odd number. It is from a Skull Fossil and it evolves into Rampardos.

Shieldon
Is a Pokemon only found in Pokemon Pearl and in Pokemon Platinum if the last digit of your trainer ID is an even number. It is from a Armor Fossil and it evolves into Bastiodon.