How do you get past the old guy in front of the cave of origin?

you have to dive where you see a sub you need to go up then team magma Or team aqua will be there go to the last room you will see a groudon or kyogre the bosses will com if it is team magma the boss will glow the blue orb if it is team aqua the boss will glow the red orb then groudon or kyogre will disappear they are at the cave of orgin in sootopolis city go to the cave of orgin there will be steven and Wallace in the way they will talk to you they will bring you to the cave of orgin over there the man is not blocking the way