POKEMON RUBY AND SAPPHIRE TEAM MAGMA'S LILYCOVE HIDEOUT

From the first room, you'll go through the door and end up at A.

After entering through A, head through 1 to get a Max Elixir. Pass back through 1 and go through 2. Head up to B. Enter C (See third map) and go through 3. Firstly go through 5 then 6 to a hidden area. Step on the warp tiles in this order: 7, 9, 10, 11

You'll end up in a room with four item balls, two are actually Electrodes, but there is also a Nugget, and an extremely valuable Master Ball. You must get this now or you will not have the chance later. Make your way back and head through 4 and then up into D.

Head through 12 to grab a Nest Ball. To continue with the story, go through 13, and to return to the entrance, go through 14 (You'll end up at 2).