Ep 19. A Guardian Rematch!

Ash and his friends are continuing on their journey in the Alola region, and in this episode, they are on their way to Melemele Island to meet up with their old friend Hala, the island's Kahuna. When they arrive, they find that Hala is in the middle of a battle with Tapu Koko, the guardian deity of Melemele Island.

Hala's recently evolved Crabominable is doing its best to battle Tapu Koko, but it appears to be outmatched. Seeing this, Ash offers to help Hala with the battle, and Hala agrees. Ash sends out Rowlet, who quickly takes to the sky and begins to battle Tapu Koko with its powerful leaf attacks.

Despite Rowlet's formidable moves, Tapu Koko proves to be a tough opponent. However, Ash and Rowlet have a secret weapon - the Z-Crystal that Ash won in the previous episode's grand trial. With this powerful tool at his disposal, Ash is able to launch a devastating Z-Move that sends Tapu Koko reeling.

With the deity weakened, Hala's Crabominable is able to finish the battle and claim victory. As a sign of respect, Tapu Koko presents Ash with a unique Z-Crystal, signifying the bond between Ash and the guardian deity.

After the battle, Ash and his friends spend some time catching up with Hala and observing a traditional Alolan festival. It's a peaceful and enjoyable day, but soon enough, Ash gets the itch to battle again. He proposes a rematch with Hala, and Hala readily agrees.

The two trainers face off in an intense battle that showcases their skills and strategies. Ash sends out Pikachu, who proves to be an adept fighter, but Hala is equally matched with his Hariyama. Despite the tough opposition, Pikachu manages to hold his own and eventually emerges victorious.

With the battle won, Ash and Pikachu are thrilled, but they quickly remember that they have another grand trial coming up. The episode ends with Ash and his friends setting off on their next adventure, eager to see what new challenges await them.