Edit: you seem not to use sonarr? Haha thought i read that, o well.. So I guess you have to rename the files so that they have s19 in the naming (the japaneese counting style) manually
😂pokemon is a mess, and I did it in german, damn, ended up spending about 30h to have all episodes correctly sorted
Sonarr shows and renames the files according the japaneese counting sceme but searches for national counting, well so it seemed to me.
So what you have to do is tag the episodes correctly in sonarr: go to the pokemon series season one, click on manage episodes, check all episodes, and change season to 19. after that, you have to apply it using „preview rename“ so that jellyfin finds the correct match.
After episode 82, sonarr should fail to auto import the episodes, so you have to add them manually from your queue.