Yup, I've bred a Nidoran male and there are shiny version on Pokecheck done by RNG abusers all with Hustle / DW ability. You breed a Nidoran female and some male of the egg group and get baby Nidoran, who can have DW ability.
Wait a minute...are you on during next Saturday/Sunday? Because I saw the bit of your VM...posted in 11:40 AM, plus...you were on at 01:08 PM. (Probably this would be known as "yesterday" in your time when you'd get it.) Well, let's trade during 11 AM or 1 PM at Saturday/Sunday.
How can we actually do the trade of the Halloween thing? We're kinda split by the issue of timezones. The PKM bit doesn't sound comfortable with me, as it would mean injecting Pokemon data down to a save file.
I vaguely remember anything about trash bytes. :s I'm not bothered by the trash bytes / nicknames thing since I've had this problem before on one of my old Pokemon. It is something weird. You can trade your Manaphy then.
I would put a brief note explaining the trash byte thing in case anyone trades for your Manaphy, Pokechecks it, and later confronts you about it. :p