You go in there after Kyogre is awakened, but until then, you don't.
the cave of origin is only in ruby and sapphire and emerald.
use their Pokemon
The Cave of Origin is in Sootopolis
Cave of Origin.
in the cave of origin in sootopolis
You can only get kyogre in sapphire you get it at the cave of origin.
The Cave of Origin is accessible through Sootopolis City.
You battle Kyogre in the Cave of Origin, in Sootopolis City.
You can get in after you beat Archie at the route 128 cavern.
Go through the cave of origin.
If by sapphire you mean kyogre (cover star of Pokemon sapphire) beat team aquas base,find them underwater on route 128 go up through the cave and he runs off.go to cave of origin.
At the Anicent tomb, Sky pillar, Desert ruins, Island cave, Cave of origin.