it seemed fine to me and opened fine in both pokesav and pokegen. pokesav doesn't verify the save at all, but pokegen does and it still opened fine.
if pokegen can't verify the save, it will reject it as not a real save file. occasionally it's just a bad checksum and there's an option to ignore checksums in pokegen. ignore the checksum, open the save, and re-save to fix the checksum.