I'm playing Emerald and the powerplant doesnt seem to exist, which doesn't bother me as the game can continue. However, after fightint at the top of Mt Pyre as you will know you don't get the blue or red orb you get another item.

After this I fly to Slateport City as stated in the walkthrough but there is noone at the shipyard. If I go to the team aqua cave I also can't do anything once inside as 2 members are blocking me. What is missing here for the Emerald version?