carboncopy
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Nope. Not at all. Unless the pokes have a gender based evo like burmy.
But, I don't care too much, however, when I plan my team, I usually try to have half my team be male and half female. I also had this thing when I was younger where I would nickname my Pokémon if they're names contradict with their genders. Mr. Mime was Mrs. Mime, and Geodude was Geogirl.
What about slowbro and slowking?