Use Strength.
Go through the jagged path and go through the cave opening u should be in team magmas base
For Sapphire and Emerald, they are not in the cave
Right above Lavaridge Town.
The base is at lilycove just a little surf by all of those wailmers
by having strong Pokemon
Surf right from Lilycove after beating the team Magmas Base
He's At the end when u go throw the hole base he has the legendary PokEmon
you have to go to team magmas base and deafeat there leader in a battle.
just walk in front of the stone when you have there emblem
first get the team magma emblem but i forgot where the hell it is, then go to mt. chimmney go into the forest start walking and after the 4 or7 crappy barrier and a boulder will shake there in a small cavern go in it and your in team magma's base.
You dont you get the magma emblem at Mt. pyre. Also magmas team base is on jagged pass
After you beat team magma's leader, Maxie, surf to Lilycove city. Beat the gym and find hm dive.Then surf to a dark blotch in the ocean.Use hm Dive.