Okay, due to Genesect's odd Speed, Electroweb might see some use on a sort of lure set. This would let Genesect slow down its opponent so it could hit it with the proper attack on the next move.
Genesect
Expert Belt/Life Orb/any other non choiced item that might work
Timid
252 Sp Attack, 252 Speed, 4 Sp Defense
Electroweb
Bug Buzz/Hidden Power Ground
Ice Beam
Flamethrower/Hidden Power Ground
EVs are self explanatory. Electroweb takes the place of Thunderbolt because two hits with Electroweb do more damage,
and you should be using Electroweb of the start anyways, unless there's good reason not to. HP Ground is slashed in because this set has a problem with Heatran, who can take all its other attacks. This puts you in a position where you have to pick your poison. Without Bug Buzz, bulky Psychics can set up and you lose STAB. Without Flamethrower, Steels neutral to Ground mess you up, while Ferrothorn beats you.
On the other hand, hitting switch ins with Electroweb is great. Faster Pokes suddenly need to take two hits before doing anything, and thus this can possibly ruin a sweep or check.