A gender strategy. It's very interesting. Either weakness foes of the same gender, or hinder the attacks of the opposite. The only real flaw would be genderless pokemon as you said, and the seldom seen oblivious ability. But I like this, people hardly ever prepare for attract, which is why it can be so deadly. I like it, perhaps having a team ready with super effective moves against some of the commonly used genderless pokemon, like Magnezone, Starmie, Metagross etc. Using your own sexiness to keep the foe at bay...