Number of episodes: 54
Synopsis:
Ash has completed three of his four grand trials in the Alola region, and more adventures await as he and his classmates acquire new Z-Crystals, make new Pokémon friends, and learn how to Mantine Surf! In their role as Ultra Guardians, the Pokémon School students take on an important mission to protect Wela Volcano. Ash meets a new rival, Hau, whose Dartrix offers Rowlet quite a challenge. Even Rotom Dex gets an adventure of its own when our heroes visit the set of its favorite TV show! And Professor Kukui's dream of starting a Pokémon League in Alola just might be getting closer to reality...
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Episode 1.
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Episode 2.
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Episode 3.
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Episode 4.Don't Ignore the Small Stufful!
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Episode 5.No Stone Unturned!
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Episode 6.Bright Lights, Big Changes!
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Episode 7.We Know Where You're Going, Eevee!
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Episode 8.Battling the Beast Within!
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Episode 9.Parallel Friendships!
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Episode 10.Alola, Alola!
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Episode 11.Heart of Fire! Heart of Stone!
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Episode 12.That's Some Spicy Island Research!
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Episode 13.Showdown on Poni Island!
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Episode 14.Evolving Research!
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Episode 15.Run, Heroes, Run!
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Episode 16.Memories in the Mist!
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Episode 17.A Grand Debut!
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Episode 18.Keeping Your Eyes on the Ball!
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Episode 19.Show Me the Metal!
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Episode 20.Got Meltan?
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Episode 21.This Magik Moment!
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Episode 22.
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Episode 23.The Dealer of Destruction!
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Episode 24.The Secret Princess!
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Episode 25.Drawn with the Wind!
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Episode 26.Aiming for the Top Floor!
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Episode 27.A High-Speed Awakening!
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Episode 28.
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Episode 29.A Recipe for Success!
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Episode 30.Spying for the Big Guy!
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Episode 31.
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Episode 32.Living on the Cutting Edge!
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Episode 33.A Timeless Encounter!
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Episode 34.Pikachu's Exciting Adventure!
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Episode 35.
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Episode 36.League Offenders and Defenders!
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Episode 37.
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Episode 38.Battling Besties!
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Episode 39.
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Episode 40.
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Episode 41.
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Episode 42.The Road to the Semifinals!
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Episode 43.
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Episode 44.
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Episode 45.
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Episode 46.Final Rivals!
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Episode 47.Enter the Champion!
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Episode 48.Z-Move Showdown!
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Episode 49.
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Episode 50.
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Episode 51.
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Episode 52.
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Episode 53.
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Episode 54.Thank You, Alola! The Journey Continues!
The Marsh King's Daughter 
The End of the Storm 
The Return of Sherlock Holmes 
The Conjuring