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First off, Ninjask needs an item over Choice Scarf clearly since it locks you into a single move which is really not good for something like Ninjask now. Focus Sash or Leftovers should do the trick while changing the nature to Impish and giving it this moveset.
For one, Shedinja needs loads of team support to work, ie Rapid Spin support to keep hazards off the field because it dies in a single switch in when Stealth Rock is on the field. The widespread use of sandstorm and hazards makes Shedinja nigh unusable in OU. Scizor should see some use:
EVs: 248 HP/252 Atk/8 Spe
Item: Choice Band
Ferrothorn is a better alternative over Weezing because of its typing and resistances:
-Gyro Ball/Thunder Wave/Protect
EVs: 252 HP/88 Def/168 SDef
Even though Gallade is my favorite Pokémon, I hate to say that it doesn't see much use in OU because base 80 Speed is just too average for a sweeper. Lucario should suffice, since its typing compensates for its low defenses:
-Crunch/Ice Punch/Bullet Punch
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb