Plot of the film is basically alternate version of the first season of the series. It has many same scenes but has changed the plot to build around the Ho-Oh encounter, which happened in series but in series that didn't affect Ash's journey. Many of the later scenes are still same ones from series, but just in different places since Ash is traveling with different goal and direction. His travelmates aren't Misty and Brock but instead Verity and Sorrel who are basically same characters but with different names and look. Bad as a movie but if you want to watch how it all started. I think it's better to watch this instead of season 1 of the series. If you are not looking for nostalgia, there are better movies.
Review of Pokémon the Movie: I Choose You!
