Hmm... do you mean Shell Bell? If so the effects of it are: Whenever the Pokemon holding it deals damage, it restores 1/8th of the damage dealt as HP. You can obtain it by giving the old man in shoal cave 4 Shoal Salts and 4 Shoal Shells.
In Shoal Cave
You have to wait for high tide.
North of Mossdeep City! Cha Cha!
You need the water to be overflowing.
go to shoal cave above mosdeep city
It's TM07 and can me found in Shoal Cave.
Go pass Mossdeep city surf to a cave where two girls are and there you are at Shoal cave hope this helped :]
Shoal Cave.
sorry but you cant .........but i wish we could BY:GAVIN/ POKEMON FAN
shadow ball isn't avalible in sapphire
snorunt and i forgot the other Pokemon it looks like a ball
u find it in shoal cave in the ice area at low tide