I hope you haven't gotten to attached to the team because I am going to be doing quite a bit of replacing if that's ok :)
Ninjask - What with Ninetales I assume you want this to be a sun team so I'm afraid that means Ninjask gets da boot. Your team has a lrge weakness to rock weaknesses and among a lot of other things it gets destroyed by pretty much any variant of Terrakion. So for a good lead I am going to suggest Rotom-W. Rotom has Levitate to support you Ninetales and Terrakion and forms the common yet effective Rotom-W + Scizor core.
Rotom-W @ Leftovers
Trait: Levitate
EVs: 184 HP / 4 Def / 144 SAtk / 176 Spd
Modest Nature (+SAtk, -Atk)
- Hydro Pump
- Pain Split
- Volt Switch
- Will-O-Wisp
Rotom-W is useful on Sun teams because it can counter Sand and Rain teams with Hydro Pump and Will-O-Wisp. Hydro Pump hits with relative oomph outside of sun and can hit things like Hippowdon and Landorus that are common in Sand, and Scizor and other common rain abusers. Alternatively, any of the pokemon previously mentioned can usually be crippled by Will-O-Wisp. Volt Switch is STAB and works well for gaining momentum and scouting. Pain Spit is the closest Rotom can get to recovery and it helps in taking advantage of opposing pokemon using recovery moves.
Staraptor - I have seen my brother use Staraptor with moderate success but Terrakion spells trouble for the team. To remedy this, I suggest, you replace Staraptor with Latios, as it check Terrakion with its Psychic STAB and overall revene kill and sweep late game like a baws.
Latios @ Choice Scarf
Trait: Levitate
EVs: 4 HP / 252 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)
- Draco Meteor
- Hidden Power [Fire]
- Psyshock
- Trick
Draco Meteor is STAB and coming off of a base 130 SAtk stat, the poor soul in the receiving end is most likely going down bar something like Specially Defensive Heatran or Blissey. Hidden Power Fire gets boosted by the sun and hits things like Scizor and Ferrothorn, while Psyshock is STAB and takes down things like Blissey that would regularly wall the crap out of Latios. Trick is for crippling opposing walls and set-up sweepers.
Scizor - I suggest you run a Choice Band set on him, he still retains relative bulk with 252 HP but he hits insanely hard with a Choice Band.
*Scizor @ Choice Band
Trait: Technician
EVs: 252 HP / 252 Atk / 4 Spd
Adamant Nature (+Atk, -SAtk)
- Bullet Punch
- Pursuit
- Superpower
- U-turn
Bullet Punch is STAB and great for late-game sweeping anf revenge killing. Pursuit serves the role of trapping enemies, specifically Ghost and Psychic types. Superpower hits Steel types such as Ferrothorn and although it lower his Attack and Defense is superior to Brick Break. U-turn forms the famous Volt-turn core with Rotom and works for hitting and running, namely by forcing a switch and then U-turning the switch in, where you can then switch in a pokemon that has the upper hand against the one they sent in.
Ninetales - I'm afraid that with the release of all the new goodies in BW2 the vaibility of Nasty Plot Ninetales has pretty much died, and you ar better off to run a defensive set desined to keep the Sun going.
Ninetales @ Leftovers
Trait: Drought
EVs: 108 HP / 4 Def / 144 SAtk / 252 Spd
Timid Nature
- Solarbeam
- Flamethrower
- Sunny Day
- Will-O-Wisp
Sunny Day is for setting your sun back up in the presence of the oh-so common Politoed switch-in, and Will-O-Wisp deals with Tyranitar and other physical threats. Flamethrower is STAB and hits with some power behind it due to sun. Solarbeam is there for coverage and is only able to be used because of Sunny Day.
Purugly - No. You can't inflict 2 major status conditions on the same pokemon and I think he'll end up death fodder. I suggest you replace Purugly with a sun abuser, specifically Venusaur.
Venusaur @ Black Sludge
Trait: Chlorophyll
EVs: 40 HP / 252 SAtk / 216 Spd
Modest Nature (+SAtk, -Atk)
- Growth
- Giga Drain
- Earthquake
- Hidden Power [Fire]
Growth is like a Nasty Pot and a Swords Dance, Giga Drain is STAB and makeshift recovery, Earthquake is coverage against mainly Heatran, and Hidden Power Fire gets der Sun boost and hits Steel types.
Terrakion - I love Terrakion, and I am going to suggest to you a set that I have been using recently with much success.
Terrakion @ Salac Berry
Trait: Justified
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Atk, -SAtk)
- Close Combat
- Stone Edge
- Substitute
- Swords Dance
The idea is you Substitute and boost your attack with Swords Dance as high as you can whithout dying, and keep going, protecting yourself with Subs until your Salac Berry kicks in, allowing you to pull off wicked sweeps. This set is not common in OU but it works extremely well, and I 6-0'd my opponent with just Terrakion the very first time I ever used it.