Yes, my sis got it from halloween quest 2014. I got a nightmare but that was no problemo as it ate blue herb, just the dullahan. I had no idea that dullahan had a custom tame though, best thing I knew was that it was only obtainable thru the halloween quests.
Man you really should update the pet wiki, you know a lot of stuff xD
Thanks for the explanation, best thing to do is wait, I guess!