Final answer:
In Detective Pikachu, the red herring is the portrayal of Howard Clifford's seemingly good intentions, which misleads the audience from his actual plan to merge humans and Pokémon.
Step-by-step explanation:
An example of a "red herring" in the movie Detective Pikachu is when the plot leads audiences to suspect that Howard Clifford, the founder of Ryme City, has benevolent intentions regarding the harmonious coexistence of humans and Pokémon. This diverts the audience's attention from his true nefarious plan to fuse humans and Pokémon, thus creating a tangent from the main issue being explored in the movie. The red herring in this case is effective because it is intricately linked to the story's central themes, making the misdirection plausible.