Root Fossil

The Root Fossil (Japanese: ねっこのカセキ Root Fossil) is a fossil introduced in Generation III. When taken to a Fossil Reviver, it will regenerate into the Sea Lily Pokémon, Lileep.

https://vignette.wikia.nocookie.net/pokemon/images/3/37/Mine_Root_Fossil_1.png/revision/latest?cb=20110524003854

Games

 * Ruby and Sapphire: Route 111 (choice between this and the Claw Fossil)


 * Emerald: Mirage Tower (choice between this and the Claw Fossil) or Desert Underpass (if you select Claw Fossil at Mirage Tower)
 * Diamond and Pearl: After you get the National Pokédex, go into the Underground and you will have a chance of finding a Claw Fossil.
 * HeartGold and SoulSilver: After you get the National Pokédex in Pokémon SoulSilver, you can use Rock Smash in Cliff Cave to smash rocks and potentially find one.
 * Black and White: A Worker in Twist Mountain will give you a random Fossil once per day after you get the National Pokédex.
 * Black 2 and White 2: A Worker in Twist Mountain will give you a random Fossil once per day after you get the National Pokédex.
 * X and Y: After entering the Hall of Fame in Pokémon X, you can use Rock Smash in Glittering Cave to smash rocks and potentially find one.
 * Omega Ruby and Alpha Sapphire: Route 111 (choice between this and the Claw Fossil)
 * Sun and Moon: Trade a Pokémon holding it into your copy of Pokemon Sun or Pokemon Moon, as the Root Fossil cannot be obtained through any other means.
 * Ultra Sun and Ultra Moon: You can buy a Claw Fossil from Olivia's jewelry shop in Konikoni City for 7,000 Pokémon Dollars in Pokémon Ultra Moon, or look for one in Poké Pelago on Isle Aphun: Path for Rare-Treasure Hunting! or Path for Interesting-Item Hunting!.