Taking a quick glance at the first two for the moment... firstly, kills, or faints? If the former how does the reviving thing actually work then, to bring things back from the dead?
Of course, it doesn't mean it can't happen, but if you don't have a buyable explanation for it then it's going to hurt the believability of the story. (There's more about that in the first post). Alternatively I'd suggest thinking up some other event if you want the guy to be cursed and then search for Jirachi with an Absol (which is a neat premise in itself, imo).
Way of the warrior sounds interesting, certainly; mixing rangers with conquest certainly is different (and as far as I know there is little in the way of conquest fic out there compared to the rest too). One thing that came to mind though; if Celebi can take them to the past, why not just take them to just before team plasma appear so they can stop them?