Walkthrough: After helping Lillie save Cosmog once again, the two of you will head back on Route 3, only to be approached by Hau. He would like to have another battle with you, giving you a nice warmup before facing Kahuna Hala for your Grand Trial. Hau's team has grown in strength and numbers since your last battle.
Hau (Rowlet Starter) - Level 13 Popplio, Level 11 Noibat, Level 12 Pikachu
Hau (Litten Starter) - Level 13 Rowlet, Level 11 Noibat, Level 12 Pikachu
Hau (Popplio Starter) - Level 13 Litten, Level 11 Noibat, Level 12 Pikachu