While I do understand the 100 acc on Flamethrower, I do perfer Heat Wave over the ladder. It hits harder and 90 acc still hits 19/20 times so it's worth it. and if someone decides to prank you with a Triples battle, it will make them regret it. Im also sayint this because it will make Ninetales hit with a little extra oomph, due to the fact your set doesnt have much for hitting things.
There are so many different Ninetales sets though, and I've seen a lot of them in my own teams so that's up to you.
Also, thanks for reminding me that Venusaur gets Weather Ball. I forgot about that and have paid for it bigtime recently ><; (Fun fact; Weather ball in sun or rain has 150 power from the move effect and the weather boost so it isnt something to take lightly.)
I look forward to battling this team in the future with my own.