It is regretable, but it obvious really who does...
And it hurts them from getting fights in the future, and more so, if it's blatantly obvious, it's insulting the judges intelligence.
Best solution I can give is either not to fight them, or request Judge-Gen matches or meowthbot generated and ask me to verify moves you find questionable.
On that note, I've begun working at making it easier for to parse through the huge (820 kb so far) logfile, making some progress, wanting to do some extra stuff with it though that isn't getting as much luck.