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you need to first go to the power plant and find out that there was a thief and then find him in Misty's gym and then interrupt misty's date on route 25
to pewter city
Beat misty then go to cerulean cape
Once you fixed the Power Plant, go to the end of Route 25. Talk to Misty and she'll return to the gym. Then you can beat her. (She uses water Pokemon so I suggest you use grass or electric Pokemon.)
If you beat the Elite Four and Champion and go in the Hall of Fame Start looking for her if you want her.