Mr Gamaken, you copied. You suggested a Life Orb first, then edited in for an Expert Belt set, much like Skymin's suggested set.
You can go deeper. Scarf Greninja don't suck, people just underlook it. Variety is not a huge concern since Scarf Greninja can run Modest and still outspeed the whole OU unboosted, which can let him hit much harder than usual. That was a mere example of Greninja's versatility.