Sceptile @ Miracle seed/petaya*/whatever, anything but leftovers, your choice.
Timid
252 Speed/SpAtk, the 4 in whatever floats your boat
Substitute
Endeavor
HP Fire, or leech seed, if you want to annoy more and force more switches.
Giga Drain
Put this set in, it's a gimmicky one, but useful in most cases where you want to surprise people. Yey, more people know it now.
Also, no fake tears vaporeon? no focus punch dusclops? Okay ;-;
And, a small side note, some people might appriciate you explaining the moveset and all. Yeah, most people here understand the role on almost all, if not all of them, but this is a guide, and a bit of description on how it works and idk, your thoughts on it would help starters a lot.
Nice job all in all, looks good