I prefer Extrasensory over Dark Pulse, just to surprise and Fighting types that people decide to throw at me, and Venusaur, of corse. I also prefer him as a lead since he can pretty much hit anything hard.
Greninja (Timid)
EV: 252 SpA, 252 Spe, 4 HP
Item: Focus Sash
Ability: Protean
Move set:
Surf (Don't like the nerfs in H.P.)
Ice Beam
Extrasensory
U-Turn/ Grass Knot
Ice Beam is a 2HKO against 4HP/0SpD Dragonite with Multiscale, and since it has a Focus Sash, even a DD Dragon Claw won't take it out in one hit. This is just my preference, yell at me if you will. xD
Also, I saw someone mention Scarfed Greninja. In my opinion, this is a horrible idea, unless you run Torrent. The entire purpose of Protean is to be diverse, not to use a single move and then be forced to switch. Not to mention, Greninja has enormous base speed. He's only outsped by priority and certain scarfers.