Pokémon (1997)

S16E31 To Catch a Rotom!

Title: The Hunt for Rotom! Plot: Ash, Iris, and Cilan reunite with Professor Oak, who is visiting the Decolore Islands to study the Plasma Pokémon Rotom and its ability to change forms. Yet, the island's Rotom seem to be more fascinated by Pikachu, Emolga, and Stunfisk, leading to some unexpected encounters as the group tries to catch the elusive Pokémon.