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The bromance angle has potential. To be honest, I think they've run out of ideas for girls, seeing as they fail to see them as equals to Ash. No, Dawn the girly Coordinator doesn't count. They only pretended that she was his equal, but her goal was an embellished version of a minor feature from the games. During her run, we got the infamous quote from Hidaka (who had been the director till late AG): "Boys need a new piece of eye candy to look at every once in a while." Her skirts supported this in spades.
I guess that "once in a while" doesn't have to be every episode anymore, hence Koharu's reduced screentime. I personally don't really care, but they aren't being fair to young girls who would like some representation on a constant basis. That's too bad.