- Ninjask is a Baton Passer, not a sweeper
- Yes, the most efficient BP'ing set I have found is this
Ninjask - Focus Sash
EVs: 252 atk, 252 spd, 4 HP
Ability: Speed Boost
This set works best as a BP'ing lead, as any other time s-rocks could break your sash. Upon starting the battle use Swords Dance, then use protect to get your speed up, then baton pass out to physical sweeper of your choice. Watch out for priority moves.