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I would’ve suggested MusicBrainz as a metadata library to pull genre tags from, but I’m pretty sure beets uses that as it’s source too. I tried beets on my collection, but ended up just using MusicBrainz Picard and tagging things manually because beets would basically pick the first match it found a lot of the time, and there was usually a more correct option in the database.
As far as bulk downloading diverse music catalogs, I don’t really know of any good sources, but there probably are music-focused trackers out there that could provide that. I’ve just slowly build my collection up album by album as I found things that interested me. Maybe check the likes of last.fm and ListenBrainz for most played music in their stats, and start collecting those?
How do you intend to access your music collection? Navidrome? or are you just building up folders of music?
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.