Detective Pikachu

Detective Pikachu is the titular character of the video game Detective Pikachu and its film adaptation Pokémon: Detective Pikachu. He is unable to effectively use the abilities most Pikachu have but seems to possess a rather high intelligence to the point where he claim to be a renowned detective.

While he sounds like a normal Pikachu to most people, only Tim Goodman and Batman can hear his vocalizations as English words and sentences.

Super Cafe: Nostalgia Detective
Detective Pikachu joins Superman and Batman at the Super Café. Superman believes that he is hallucinating the Pikachu from playing too much Pokémon Go, but Batman confirms that Detective Pikachu is real. As Superman delightedly meets Detective Pikachu, Batman explains that Detective Pikachu is looking for advice on how to be a real detective, and the three afterwards discuss live-action reboots and recycling material.

Trivia

 * Detective Pikachu is voiced in the film by Ryan Reynolds. Ikue Otani, who provides the voice of all Pikachu in the Pokémon anime, provides his Pikachu vocalizations.
 * Ryan Reynolds's portrayal is referenced in Nostalgia Detective, where Batman comments on how Detective Pikachu sounds like Reynolds's other character Deadpool.