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.
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If you can find a desert, look around you just might get lucky and find a couple of fossils that are lily-- and anorith. so yes you can get them
Bulbasaur, Ivysaur, VenusaurOddish, Gloom, Vileplume, Bellosom Paras, Parasect Bellsprout, Weepinbell, Victreebell Eggsecute, Eggsecutor Tangela, Tangrowth Chikorita, Bayleaf, Meganium Hoppip, Skiploom, Jumpluff Sunkern, Sunflora Celebi Treeko, Grovyle, Sceptile Lotad, Lombre, Ludicolo Seedot, Nuzleaf, Shiftry Shroomish, Breloom Budew, Roselia, Roserade Cacnea, Cacturne Lilleep, Cradily Tropius Turtwig, Grotle, Torterra Wormadam (Grass Cloak) Cherubi, Cherrim Carnivine Snover, Abomasnow Leafeon Shaymin