Heart of Fire! Heart of Stone!

Ash's old friends Brock & Misty are still in Alola and the group decide to go to Akala Island so Brock can meet the famous Rock-type Island Kahuna, Olivia. Brock is very excited to meet her, leaving Olivia a bit bewildered when they meet, but when she learns that he was a Rock-type Gym Leader, she challenges him to a battle. Who will win?