Rage Fist is infinitely better than Poltergeist. After getting hit a single time, its BP is already almost equivalent, and it can scale far far higher. This allows Necturna to act as a wall, breaker, and wincon all at once. Rage Fist also can't miss, or fail whenever the opponent loses its item, or quickly run out of PP, and it doesn't depend on Attack or Speed investment. The two moves are not remotely equivalent or even comparable.Even though Necturna got nerfed it could still sketch Poltergeist despite not learning it naturally through TM. That would patch up its main issue of no good Ghost STAB
Necturna could compensate for losing Rage Fist by using other moves or other sets –– but what is it actually doing, right now, in the metagame? We don't know yet, because it's barely been a week since the nerf was implemented. If you're going to post in this thread, please try to support those opinions with evidence, even if it's just anecdotal evidence. Or at the very least, explain the reasoning behind your opinion, instead of just stating it in one or two sentences and not backing it up.
I already had to delete a one-liner since my last post two hours ago. You don't need to post an essay, or even a full paragraph, but it should take more than 10 seconds to think of and type out.