Ep. 20: Ash and Pikachu kayak to Treasure Island and rescue a trapped Wimpod with help from local Pokémon.
Aired on April 6, 2017

20
Following a shopkeeper's suggestion, Ash and Pikachu travel by kayak to Treasure Island, encountering various wild Pokémon. They observe Crabrawler chasing Cutiefly into a meadow of friendly bug Pokémon and interact with Alolan Exeggutor. Their outing is interrupted by a school of Wimpod attempting to steal their food. As they prepare to leave, they discover a Wimpod trapped in a blocked cave. Using assistance from an Exeggutor they met earlier, Ash and Pikachu free the trapped Pokémon, which then rejoins its group. Before departing, they encounter the Island Guardian Tapu Lele, who heals the bruises on Ash's hands.
Episodes
- Ep. 16 · Popplio and Rowlet drift into Team Rocket's base after a training accident.
- Ep. 17 · Rotom and Pikachu investigate the disappearance of Ash's Electrium Z-crystal
- Ep. 18 · Mallow seeks rare Yellow Nectar for stew while Ash helps and Team Rocket interferes
- Ep. 19 · Ash prepares for a rematch against Tapu Koko with help from Sophocles' scientific methods.
- Ep. 20 · Ash and Pikachu kayak to Treasure Island and rescue a trapped Wimpod with help from local Pokémon.
- Ep. 21 · Ash and Pikachu encounter Litten and the aging Stoutland, leading to a poignant farewell and a new bond.
- Ep. 22 · Ash and Litten are swallowed by Palossand after a shovel incident
- Ep. 23 · Ash and classmates meet DJ Leo and his quarreling Alolan Dugtrio while Team Rocket attempts a theft.
- Ep. 24 · Delia and Mimey visit Pokémon School while Ash prepares a report before Team Skull attacks.