In the core series games
If brought to the one of the following locations, the Root Fossil can be regenerated into a Lileep.
In the Generation III games, the Root Fossil is a Key Item.
In Pokémon FireRed and LeafGreen, the Root Fossil (as well as the Claw Fossil) is found in the game data, but it is not legitimately obtainable and has no effect. The player is unable to regenerate this fossil in the Cinnabar Lab.
Generation IV onward
From Generation IV onward, the Root Fossil is no longer a Key Item, and is a normal item. Therefore, multiples of them can be obtained, they can be held, and sent to other players via trading.
||A fossil of an ancient, seafloor-dwelling Pokémon.
||A fossil of an ancient, seafloor-dwelling Pokémon. It appears to be part of a plant root.
|A fossil of an ancient Pokémon that lived in the sea. It appears to be part of a plant root.
|A fossil from a prehistoric Pokémon that once lived in the sea. It looks as if it could be part of a plant's root.
In the anime
In the TCG
In other languages