Pokémon S16E38 - Mystery on a Deserted Island!

Heading to the next island, Alexa informs Ash & Co. that there are rumours of a hidden treasure on a nearby uninhabited island. Ash & co. decide to investigate this to try and find the treasure, helping Alexa to solve the mystery she learned when doing a report years before. However, Team Rocket have heard about the treasure as well and head there, and to top it off, the wild Pokémon on the island are intent on protecting it. Will Ash & Co. find it?