Ninjask as a subpasser is so lame it's not funny, sure the speed boosts can help a bit, but I suggest replacing it with a subpassing vappy
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Calm Nature
EVs: 188 HP, 252 Def, 68 Sp Atk
-Substitute
-Baton Pass
-Wish/Ice Beam/HP Electric/Surf/Protect/Toxic
-Wish/Ice Beam/HP Electric/Surf/Protect/Toxic
I personally use Wish and Protect in the last two slots, but then I never allow vappy to be my last pokemon, if that is your concern, then I have provided other options. Toxic also works well on Vappy, it's really up to you.
But yeah, Ninjask is just a dead weight
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Angelic Diablo's
PokePet

Slicer the level 46 Scyther!