Ah, I couldn't recall from the anime. Though sorry I had not disclosed about how the Harbinger acts. It won't tell you if you did or good job or a bad job, merely that you have passed or not.
Nah, not Arceus, but along those lines (if anything perhaps more powerful than Arceus, you'll just have to wait and find out) XD
Probably more than used against. XD "Loss of innocence" is not without its conflicts. XD (accidental sexual connotations aside though). Needless to say the whole "harbinger is watching" thing, will make it quite fun. XD Though with the girl, when I give you your next challenge (wheneever that might be), she won't be allowed to aid you in any way shape or form. Aside from cheering or something XD