Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Hrm... within the bug theme, I think Venomoth is your best option. Not a whole lot of other choices really, though Compoundeyes Butterfree is excellent for inducing sleep.
If you're having problems with Scyther's set, switch to Choice Band and drop SD for U-turn or Quick Attack. Also move the...