She will be in icefall cave on four island to get to her you need the HM waterfall which is found in the cave use it to go up the waterfall then go to the ladder lorelei will be there and some rockets deal with the rocket then talk to lorelei now you must go to six island and go to dotted hole and get the sapphire but its stolen! Go to five island and go in the rocket warehouse find the guy who stole the sapphire and beat him in a battle take the sapphire to one island and to Bill's friend Celio go back to six island and go in the Pokemon center your rival should be there unless you saw him before now go back to the elite four lorelei should be there.
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The first stage of the Elite Four in the Indigo Plateau.
did you get the ruby?
Get team rocket to go out of five island hideout (using the blue gem) and talk to Lorelei.
you have to find both stone to get her back which is the ruby and sapphire and take them to one island and give them to the guy in front of the machine hint the ruby - mount ember and the sapphire-dotted hole use cut on the door to get in hope i helped
Deliver the ruby and sapphire to Celio if you did that go make sure lorelei is not in icefall cave if she is talk to her then leave and go to the elite four now she should be there but if not this means you have not seen your rival on six island he's in the Pokemon center.