Once I’ve stopped shaking uncontrollably, and the Rotomdex has reassured me that the horrifying undead Pikachu I just fought is only another Pokémon (a Ghost/Fairy-type called Mimikyu), Acerola offers me some suggestions on what to do next.  Although my success in her trial was in some respects debateable – I was, she reminds me, only supposed to get a photograph of Mimikyu, not give its lair a new back door – I did basically achieve its fundamental objectives, so she presents me with her crystal, the Ghostium-Z.  As Ula’ula Island has only two Captains, that means I now have the right to challenge the island’s Kahuna.  Acerola declines to explain who or where the Kahuna is right away, though, and invites me back to Aether House to talk it over there.  Unfortunately when we get there, with Hau just a few steps behind, someone who is definitely not the Kahuna is waiting.