Walkthrough: At the top of Wela Volcano Park is your next Island Trial, the one set by Captain Kiawe. This Trial is a little different from the ones before it, having you look at two different dances by Alolan Marowak before having to spot the difference. If you fail, Marowak will Battle you and you will have to try again. If you succeed, Marowak will still battle you but you will progress to the next dance. A hiker is then added to the mix, with you having to face off with his Level 19 Magmar, before the final Challenge with the Totem Pokemon.
After getting the final dance answer correct - which is actually the only guarantee apart of the Trial - you will Battle the Totem Pokemon, which is Salazzle at Level 22. This Time, the Totem Pokemon will have its Special Defense raised one stage as the battle begins, with the ability to call upon Salandit at Level 20 for help.
After defeating the Totem Pokemon and all the Pokemon it calls upon for help, you will have defeated your third Island Trial. You will then be given Firium Z by Captain Kiawe, and Route 8 will become unlocked.