I have about three teams in progress that need a ninjask.
Well, along with two teams, I have two reasons for one.
First, I need a baton passer with typical baton pass EVs. It's a swords dance/baton passer, were you send it out against a wall. The wall tries a crippling move, but ninjask uses substitute, and messes it up, or if the foe withdraws, it will have to break the sub first. If it is a wall that fails with a crippling move, a swords dance should be safe as they try to swap out to a pokemon that could break the substitute. protect if they do this, and them safely baton pass. If the opponent swaps out right away, it sadly won't be safe to baton pass, unless you baton pass to a pokemon that could take the hit.
Number two requires an adamant ninjask with 252 sp.attack, a 252 HP, and I don't see any point in speed EVing that thing. The point is to safely baton pass as many nasty plots as possible, then outspeed every thing with 160 base speed.