The usual fix from the Jellyfin docs would be to check you file naming conventions, and add the TVDB or TMDB show ID to the folder so that it scrapes it correctly, or use the Identify option like @Rudee mentioned to select a better match from the UI after import.
Both TVDB and TMDB consider Pokémon Journeys to be Season 23 of the original Pokémon show, the OMDB seems to list it as a standalone show though, so you could import and match it against that metadata.