In this prequel episode to Pokémon: Indigo League, Pikachu's backstory as a Pichu, his being cared for by a Kangaskhan after falling off a cliff, and the events leading to his evolution into a Pikachu and eventually meeting Ash are revealed.

Three years ago, Goh met a boy named Horace on a family trip to Azalea Town in the Johto region.

In the present, Goh returns to Azalea Town and ends up encountering the ghosts of his past.

"Pikachu Translation Check...": Meowth has caught a bad cold, and the rest of Team Rocket are not providing much comfort.

Meowth realizes just what it is that Team Rocket is lacking but falls asleep before he can tell the rest.

The season premiered from November 17, 2019, to December 4, 2020, on TV Tokyo channel 7, and in the United States, it releases as a streaming television season that premiered from June 12, 2020, to March 5, 2021, on Netflix, making it the first Pokémon series not to air on conventional broadcast television in the USA, unlike previous series.

for 20 episodes and for 4 episodes ended in odd numbers, 41, 43, 45, and 47, the Japanese main theme song of Pokémon the Movie: Secrets of the Jungle, "Strange and Wonderful Creatures" (ふしぎなふしぎな生きもの, Fushigi na Fushigi na Ikimono) by Tortoise Matsumoto (Ulfuls) for 1 episode to promote the movie,[10][11] and the English opening song is "The Journey Starts Today" by Walk off the Earth.