Ninetailes shouldnt be looked at as a offensive presence , but as a teamplayer.
Using a spread of something like :
Scouting Fox @ leftovers/balloon
Nature : Timid
EV's : 200 HP/232 SPE/ 78 DEF
Moves : Protect , disable , roar , flamethrower
Using this set requires a lot of skill , but its really worth using it. A lot of people know this set , but i wanted to point it out again because its so amazingle effective.A lot of people only run 1 move that can hit Ninetailes supereffective , the idea is to protect , and than disable that move. When they bring in a other pokemon to take ninetailes out , predict and either attack or roar the pokemon away , racking up entry hazards damage. Roar also prevents it from being set up bait for things like dnite and volcarona. If your afraid of pokemon that can use more moves to kill ninetailes , try running balloon. For example , now that sword dance gliscor with facade and earthquake can touch you .Disable isnt only usefull to save his own ass , it can be used to create free switches for his teammates.
HP
The HP ev's let ninetailes hit 337 hp , a leftovers number +1 if this is your item of choice. If using balloon , you can simply use max hp , but it wont allow him to survive much more.
Speed
Using max speed on ninetails is quite useless in OU , seeing the only base 100;s in OU are : Celebi , Jirachi , Salamence , Tentacruel , Volcarona and other ninetailes. With most fire moves and drought , jirachi and celebi are beaten anyway , and he has no chance of stopping salamence from dding , and tentacruel from toxic spiking. Volcarona just sets up on him if he doesnt pack roar ( for wich he doesnt need max speed). You want to outspeed both max speed haxorus and gliscor tough , do to this we need a timid nature and 232 EV's
It doesnt really matter where you put the rest of the EV's , i used it on defense because this helps taking random hits overall ( like iron head from jirachi etc or aquajet from azumarill). With drought aiding in flamethrowers power , i dont see why i should be using SPA on this set , rather than koing or 2koing specific threaths.
As for the moves , disable , protect and roar are a must for above reasons. You can pack certain decent moves for in the last slot. An attacking move should be used( energyball , overheat , fireblast) , tough it has tons of other options like safeguard , confuse ray , toxic , will o wisp , hypnosis, and magic coat. I did not try a trapping set with fire spin , tough it sounds interesting.
Most teams with a SR weak pokemon need to have a rapid spinner , and a team with ninetailes is no exception. Donphan is easily one of his best partners. Drought takes away that pesky water weakness , and ninetailes has no trouble dealing with grass and ice pokemon whatsoever.Ninetailes also can disable water takes ( like scald on vaporeon) for donphan. Donphan can in return rapid spin , attack with stab eq ( to take out ttar for example) and utilize ice shard to revenge or weaken dragons. I should also note that donphan learns fire fang , wich combinded with drought gets a whopping 97 base power wich can be used to kill ferrothorn , forry and skarmory , all three are pokemon that like to set up on donphan. Fire fang deals 37.1% - 44.3% damage to physically skarmory ( 49.7% - 58.7% on specially defensive), tough this isnt enough to 2ko , a lot of skarmory will try roosting in your face and a fire fang + SE earthquake is a easy ko. Some more calculations for fire fang :
Donphan , 252+ atk /252hp with sturdy and leftovers Fire fang
vs NastyplotCelebi( wich will always set up on you first) : 63.6% - 75.1%( a ko combined with ice shard and SR damage/lifeorb damage)
vs Bandedscizor : 129.4% - 152.8%
vs GrowthVenusaur : 85.4% - 100.7% ( good chance to ko with SR/life orb damage)
vs SubsporeBreloom 100% - 118.2%
vs Subsplitgar : 63.7% - 75.2%(wich he can only hit with ice shard otherwise)
vs CMVirizion : 84.5% - 99.7%
Its been working greatly for me , so i just wanted to share this.
Note : I dont take credit for the ninetailes set , just wanted to show what it can do!