The concept is good, but the lack of coverage hurts. Genesect is better with Rock Polish or Choice Scarf. You'll have to hit the switch-in with Nitro Charge; it's a bit risky if a Heatran switches in and gets the Flash Fire boost.MY current favourite set for genosekuto is:
Genosekuto@Life Orb
Naive(+Spe/-SpD)
156 Spe/176 Atk/176 SpA
~Nitro CHarge
~Thunderbolt
~X-Scissor
~Flash Cannon
ThIs mixed set works a treat since you can get the speed boost from nitro charge, and the attack/SpA boost from download, and sweep away with that
Anyway, here are my own modifications to the above set:
-Nitro Charge
-X-Scissor
-Ice Beam/Thunderbolt/Flamethrower
-Ice Beam/Thunderbolt/Flamethrower
Nature: Naive
Item: Life Orb
EVs: same spread as above.