Last generation Ninjask was struggling to stay in OU, mostly due to its pathetic defenses, lackluster offensive movepool, and x4 Stealth Rock weakness. Its stat spread makes it appear to be an offensive Pokemon, but it cannot function as such. Instead, it is relegated to the position of Baton Passing, which fits it actually quite well due to its blistering speed, which is only second to Deoxys-S, and Speed Boost Ability. It has dropped to NU this generation due to the introduction of team preview and newly introduced Pokemon that threaten it, particularly Prankster users, who can taunt it before it can Baton Pass. Ninjask still works well in the lower tiers though, where it is harder to prevent it from doing what it does best.
Abilities
Speed Boost: This is practically the only thing that makes Ninjask stand out. It allows it to Baton Pass at least one speed boost if the opponent doesn't have a faster Taunt user.
Infiltrator: If you're running an offensive set, this might be a superior ability, but then Ninjask will lose its niche. Accelgor also does this better due to its higher offensive stat and better move coverage.
Baton Pass
Ability: Speed Boost
Item: Leftovers
Nature: Impish
EVs: 248 HP / 236 Def / 24 Spe
- X-Scissor / Protect
- Sword Dance
- Substitute
- Baton Pass
This set is the best Ninjask can manage in pretty much any tier. The idea is to set up Substitute as soon as you get the chance, then use Swords Dance on the next turn as your opponent breaks it. By that time you'll be able to pass at least one more Speed Boost by using Protect. After that, Baton Pass and bring something in that benefits from +3 speed and +2 Attack such as Rampardos. X-Scissor prevents Ninjask from being total Taunt bait, but shouldn't see much use anyway. More speed can be invested to outpace Accelgor who can OHKO with Hidden Power Ice.