Davon this looks pretty good, Ninetales is pretty straight forward after all.
-Moves-
Energy Ball hits bulky Rock types too. Make Will-O-Wisp its own seperate bullet point (I'm still not sold on Will-O-Wisp, but others seem to think its slash worthy).
-Set Details-
Mention an alternative EV Spread in Set Details for Leftovers Ninetales, it's a nice option for longevity as you take a ton of special attacks better and you can live Aqua Jets more easily without being forced to run Passho Berry (mentioning losing out on certain pokemon like jynx, tying with typh etc in favor of more bulk). I've run 112 HP / 252 Spa / 144 Spe with a Timid nature to a lot of success, this allows you to outrun everything up to max speed Rotom-S. I know
Deej Dy likes to run bulkier builds of ninetales so maybe he can add some input as to what an optimal spread is (I'll probably run some calcs on the SpA investment later and figure one out regardless but the one I listed is good enough for now).
-Usage Tips-
The way you talk about wisp makes it seem like its the most important move on the set, I definitely wouldn't say to 'use it as much as possible' everything is situational and it honestly depends on what the opponent has to switch into tales. I'd change this to mention common Ninetales switch ins that are targets for wisp, and maybe add a mention that its only useful on the initial switch into tales (provided you hit lol).
You kind of touched on how orb tales gets past certain pokemon with greater ease due to XHKOing them after a boost, mention how lefties tales plays differently in these situations (setting up may not be the best play where as just attacking for chip damage can be helpful for later).
-Team Options-
Change Lumineon to Prinplup, it's just better at defogging and being pure water-type. Remove the term 'fire spam' core (even though this might be the one place it hasn't been misused; a word like spam probably doesn't belong in an analysis) and change it to say something like 'a potent fire-type core' or 'powerful special attacking Fire-type core.' Mention more than just fighting types as a way to deal with audino, I might even change this to special defensive walls >audino/licky and physical attackers > fighting type (still mention audino and sawk, but this distinction covers more than those select pokemon).
-Checks & Counters-
Mention that aqua jet users need to watch out for passho tales/ passho tales doesnt need to worry about them as much.
Only other thing I want to mention is that when you do your write up, C&C might be a little difficult seeing as there are more checks than dedicated counters to this thing. Mentioning specific scenarios regarding unboosted vs boosted tales and how said counter/check deals with it would be good.
Make those changes and
QC 2/3.