Like as said, as long as the file you have on the save is different from the file/checksum that the server uses, you won't be able to share the raid online.
So even if you can predict the slots the species will be in, and change the items rewards etc, and impossibly create a copy of the file that WOULD be used, as long as it's different from the one the server is currently having, the raid won't be sharable.
Look, if you want SHARABLE raids, either rely on RAM or ROM hacking. The file in the SAV would only ever be sharable if it's the same as the server, i.e no sharing edited files online.
Please read and learn what I've just said, thanks.
Please understand that I feel frustrated; I've repeated these points a few times already, and it seems as though you're just glossing over them