Genesect @ Douse Drive
Nature: Hasty (+Spe, -Def)
- Techno Blast (Water)
- Iron Head
On this type of moveset, Genesect is primarily attack up and speed up. If it seems easier to do special attack up and speed, you may do so as well.
With the corresponding Download ability, Genesect can use U-Turn to upgrade either special attack or attack, thus making it raise stats without having to do much. On a Hasty ability, it's speed is raised and benefited making for a sure hit and run. This move is great in combo with other Pokemon that have either the move U-Turn or Volt Switch. This move also seemingly gets STAB and if super effective, it may faint the opposing Pokemon.
When the Download ability is applied at least twice with Genesect (assuming you used the U-Turn hit and run method), and you get at least two stages up for special attack, it is safe to assume that Techno Blast will faint a Pokemon if super effective. With fire being its main weakness (and a 4x weakness!), it would be smart to have a repellent against the opposition.
Flamethrower yields coverage over many Pokemon. The main goal of utilization of this Pokemon is to repel over grass types using fire type moves (Ex. Gourgeist, Lombre, Ludicolo), ice types who can cause plenty of status changes which mess with gameplay, or steel types who can heavy hit with fire type moves (Ex. Mawile, Lucario, Aggron).
With Iron Head, one can take care of fairy types (which wouldn't have bothered anyway due to typing), ground types (who do average damage, however worse with the nature), and ice types who wouldn't have done so much anyway.
Things To Watch Out For:
Certain Pokemon, depending on ability and time utilized in battle, may outwit the strategy of U-Turn + Download, etc. Pokemon with the speed boost ability may start to out speed in battle if not taken out, and if that Pokemon just so happens to know flame charge as well, Genesect will be in a world of hurt. If this occurs in battle, your best option is to take it out with another Pokemon, or if reckless enough, try out speeding the Pokemon (By the way, Pokemon that can wield both flame charge as a move and speed boost as an ability: Blaziken).