You don't get it. Because you're underage, and thus irrational. I know instinctively that females cannot be bros, and when you ask why, I can come up with reasons why. The fact that they get fucked is one of them.
Bros have these traits:>strong>assertive>takes charge>fucks
Females have these:>weak>submissive>follows >gets fucked
In humans, females are on average far weaker and less competitive. As such, I instinctively view females as being incapable of rising to the level of bro, because as a male, I wouldn't trust my back to a female when that would be weak protection. This doesn't apply to all species, and since Pokemon are based on all sorts of animals, the females can often be stronger. However, this doesn't matter to me on an instinctual level, I can't change the hardwiring that makes me depend on males rather than females.
Thus no female pokemon will ever be on my team. And thus no underage pokefucking phoneposter will ever win an argument with me.