Series as long-running as Pokémon are bound to be riddled with mysteries, and one of the biggest has huge implications for Ash & Pikachu's relationship. In 2017, Pokémon The Movie: I Choose You! climaxed with Ash desperately asking Pikachu why he wouldn't return to his pokéball. Audiences were stunned when he received an answer in plain English. Since then, the reality of the scene has been the subject of heated debate.