1. You go to the desert and pick the root fossil
2. Take it to a guy on a computer at the Devon corporation in Restrubo
3. Go out of the room, go back inside, and receive your lileep
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It evolves at level 40 so just keep leveling your lileep!
To get a Lileep in Pokemon Ruby, Sapphire and Emerald you need to revive a Root Fossil. The Root Fossil can be found on Route 111 however choosing it will cost you the ability to get the Claw Fossil. Alternatively you can trade for a Lileep from another game if you've picked the Claw Fossil.
Lileep only evolves at level 40.
lileep. According to my research, lileep has a special ability called storm drain, that is, absorb all water attacks. lileep also is ineffected by any attack (Reg. or lower damage dealt to lileep) except for ice moves. Lileep will prove useful against Wallace in the long run. Anorith has swift swim, which is a common ability.
Lileep learns Ancientpower at level 43.