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Okay, so I'm probably decades late on this, but can Pokemon not tell the gender of other Pokemon? I've been watching Pokemon BW, and in episode 705 both Oshawott and Meowth have a crush on a Purrloin that in the end turns out to be a guy. Pic is their reaction.
There have also been countless instances where mons would attempt Attract only to find out the gender of the target to be the same as the user's. /