Scyther can actually do a pretty big amount of damage with fury cutter.
Item: Metronome/wide lens/evolite (whichever you find best)
In case you don't know, Fury cutter starts off with a measly base 20 power, but it doubles after each successful use, going from 40, to 80, and peaks at 160. Scyther gets STAB from it since he's a bug type, as well as a power up from technician. On top of that, you can use the metronome, which powers up moves used repeatedly.
base power X STAB X technician X Metronome level
Turn 1: 20 1.5 1.5 1.1 = 50 base power
Turn 2: 40 1.5 1.5 1.2 = 108 base power
Turn 3: 80 1.5 1.3 = 156 base power
Turn 4: 160 1.5 1.4 = 336 base power
Not the greatest strategy, nor the most dependable, but it's still pretty nice.