Imagine if you had a dog. The dog is your bro.

Then suddenly, another dog comes up, mounts your "bro", and sticks his dick inside. And then he humps and humps and your "bro" loves it, and ends up impregnated and having a litter.

That is not a bro. Your bro should be an alpha dog fucking all the bitches, not getting fucked himself. And that's why you should never have female Pokemon on your team.