For a secret bas you need the move Secret Power taught to one of your pokemon, then go up to one of the indents in the wall or a huge fat tree, and use secret power on it, ka-ching! there you go.
you can get it from the guy in the slateport market
also check the egg's status
what does it say?
[Edited by PokePrincess, 3/22/2007 4:26:55 AM]