There's no topic regarding this.
If you're like too, first change the species of any one raid (Use this to know what the bytes mean (https://projectpokemon.org/home/docs/gen-8_156/wild-area-news-normal_encount-version-r139/)
Then drop the file in the reader to see if you edited the species correctly
(https://projectpokemon.org/home/files/file/4030-eventpromoted-raids-reader/)
Even if the reader reads the file correctly, there's no guarantee that your file is functional, but it is a start.