The narrator usually speaks at the beginning and ending of each episode. In the beginning of an episode, he usually informs the audience of what Ash Ketchum and his friends are doing or where they're heading. Sometimes, he'll even explain what they did in the previous episode. He would usually conclude the episode with what Ash and company had learned during the episode or say what they were planning to do next. In movies, he usually is only heard at the beginning giving an overview of the Pokémon world.
In some of the episodes featured in the Weekly Pokémon Broadcasting Station, some of the regular characters would narrate the episode in first person in place of the narrator. When the episodes were dubbed in English, their narratives were replaced with the regular narration. The only time the first-person narration was kept from the Japanese version was at the beginning of Get the Show on the Road.