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If you want a good sense at where casuals stand, remember that when Pokemon adult parodies (not just porn but porn is included) or skits are made, even to this day they default to Ash being the guy and misty being the girl even when the circumstance makes no sense.
I wouldn't know why, maybe because of pokemania? But Misty's general fame eclipses the rest of the pokegirls. It's not so much shipping as people automatically thinking misty is the love interest