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I didn't know about the males not evolving when I first played. Figured out the hard way.
Pokemon that only evolve with certain gender (like combee) are some of my least favorite things in the series. It does nothing except punish people playing blind.
That and they got a better gender ratio that's pretty much 50-50.
Whereas Combee and Salandit are a roughly 12% chance of getting the right gender that can actually evolve. Which is just tedious unless you get lucky.