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Dune Wikia said:During close-quarters combat, an individual adept at the Weirding Way is able to maneuver around and strike an opponent at unimaginable speeds. To the opponent (and any bystanders) the movement seemed almost like close-quarter teleportation.
The metagame of NU Stage 9 is damn fast. Ninjask is faster. When you absolutely, positively, have to go first, Ninjask is your insect. It outruns most everything on its first turn in, scarf or no. By the second, there's just no competition. Ninjask is not strong enough to be a standard sweeper, but it's just about the best sweeper-sweeper there is.
Ninjask might not have the highest attack in the tier, but its STAB moves are very useful against many of the best Pokemon around. In fact, Ninjask can beat the crap out of Sawk, Primeape, Scolipede, Gardevoir, and Jynx. That's right, five of the top eight 'mons from the last month. That Serperior guy everyone's talking about? Yeah, Ninjask kills practically all of those*.
252+ Atk Expert Belt Ninjask Aerial Ace vs. 0 HP / 4 Def Sawk: 254-302 (87.28 - 103.78%) -- 62.5% chance to OHKO after Stealth Rock
252+ Atk Expert Belt Ninjask Aerial Ace vs. 0 HP / 4 Def Primeape: 305-360 (112.54 - 132.84%) -- guaranteed OHKO
252+ Atk Expert Belt Ninjask Aerial Ace vs. 4 HP / 0 Def Scolipede: 223-266 (85.11 - 101.52%) -- guaranteed OHKO after Stealth Rock
252+ Atk Expert Belt Ninjask X-Scissor vs. 4 HP / 0 Def Gardevoir: 382-449 (137.41 - 161.51%) -- guaranteed OHKO
252+ Atk Expert Belt Ninjask X-Scissor vs. 8 HP / 0 Def Jynx: 593-701 (217.21 - 256.77%) -- guaranteed OHKO
252+ Atk Expert Belt Ninjask X-Scissor vs. 60 HP / 0 Def Serperior: 281-331 (91.83 - 108.16%) -- guaranteed OHKO after Stealth Rock
*Bulky Subseed sets with HP Rock are problematic, if they're behind a sub already.
But wait, there's more! Are sun teams giving you problems?
252+ Atk Expert Belt Ninjask X-Scissor vs. 4 HP / 0 Def Sawsbuck: 360-425 (119.2 - 140.72%) -- guaranteed OHKO
252+ Atk Expert Belt Ninjask X-Scissor vs. 132 HP / 0 Def Exeggutor: 610-725 (167.58 - 199.17%) -- guaranteed OHKO
252+ Atk Expert Belt Ninjask Aerial Ace vs. 4 HP / 0 Def Victreebel: 283-338 (93.7 - 111.92%) -- guaranteed OHKO after Stealth Rock
252+ Atk Expert Belt Ninjask Aerial Ace vs. 248 HP / 44 Def Jumpluff: 254-302 (71.95 - 85.55%) -- 75% chance to OHKO after Stealth Rock
252+ Atk Expert Belt Ninjask X-Scissor vs. 4 HP / 0 Def Shiftry: 811-955 (251.86 - 296.58%) -- guaranteed OHKO
No longer!
Ninjask fares somewhat less well against Swift Swimmers, but it can outspeed and hit some of them if you need a ridiculously fast revenge kill to wrest back some momentum.
252+ Atk Ninjask X-Scissor vs. 124 HP / 0 Def Floatzel: 180-213 (52.63 - 62.28%) -- guaranteed 2HKO
252+ Atk Ninjask X-Scissor vs. 96 HP / 0 Def Seismitoad: 142-168 (37.86 - 44.8%) -- guaranteed 3HKO
252+ Atk Expert Belt Ninjask X-Scissor vs. 0 HP / 0 Def Ludicolo: 360-425 (120.4 - 142.14%) -- guaranteed OHKO
252+ Atk Ninjask Aerial Ace vs. 64 HP / 0 Def Mantine: 112-133 (39.02 - 46.34%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Ninjask X-Scissor vs. 4 HP / 0 Def Gorebyss: 108-127 (42.85 - 50.39%) -- 93.36% chance to 2HKO after Stealth Rock
Trick room teams giving you problems? Well, at x3 speed with a choice scarf, Ninjask can go faster than the rules themselves in order to outspeed anything under the effects of trick room.
252+ Atk Expert Belt Ninjask X-Scissor vs. 252 HP / 4 Def Beheeyem: 338-398 (95.48 - 112.42%) -- guaranteed OHKO after Stealth Rock
252+ Atk Expert Belt Ninjask X-Scissor vs. 252 HP / 4 Def Eviolite Duosion: 310-367 (92.81 - 109.88%) -- guaranteed OHKO after Stealth Rock
Whapow! Don't use Choice Scarf Ninjask, though. It's a bad idea. Instead, use something like... this!

Ninjask @ Expert Belt
Trait: Speed Boost
EVs: 252 Atk / 220 Def / 36 Spd
Adamant Nature
- X-Scissor
- Aerial Ace
- Protect
- U-turn/Baton Pass/Swords Dance
With no HP investment, Ninjask can switch into Stealth Rock twice if need be. Expert Belt gives him some extra oomph while preserving this quality and allowing for flexibility in moves. I guess you can fake a choice band set, too. The idea is that Ninjask is going to outrun anything without a scarf. With 36 speed EVs, it even outruns Zebstrika. After one turn, it outruns every possible scarfer in the tier sans Swellow and Electrode. It can also beat out practically every Swift Swim or Chlorophyll abuser. The rest of the EVs are poured into defense to maximize physical bulk, since every single priority move (sans Riolu's 4x resisted Vacuum Wave) in the tier is physical. This Ninjask can tank Floatzel's Aqua Jet twice!
X-Scissor and Aerial Ace are obvious STAB moves. Protect lets Ninjask get a free turn of Speed Boost, which is handy for outrunning scarfers. Even better, using it on the first turn in might convince your opponent that you're using a Baton Pass set or something. It also has the handy side-effect of wasting turns of rain and sun. The last slot is a matter of preference. I use U-Turn to keep Ninjask around if there's an incredibly fast threat on the opposing team that only he can outrun, while still dealing some damage. Because nothing is immune to Bug and Ninjask is practically guaranteed to go first, it's strictly better than a dry switch. Swords Dance is another option if you want to sweep, and has the added benefit of tricking your opponent further into believing you have a baton pass set. Beware, though. Ninjask's defenses are still atrocious, and he can have a hard time getting chances to boost. Switching into a choice-locked Fighting or Grass move is a good way to get one.
Obviously, there are other sets that one can use. What do you think of the fastest Pokemon in NU?