guess and hope so
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I guess Ash will marry Misty, because how I know is I heard Misty's best friends are her togepi and Ash. Even in Misty's Song Ash and Misty sounded romantic. Besides Misty is one of my favorite Pokemon trainers.
Pokemon: Advanced Challenge: Episode 3: The Princess and the Togepi
The answer, of course, is a matter of personal preference. But, in my opinion, Misty is the best.
Once you're in the Kanto region, go up the Nugget Bridge and go to Bill's House, just north of Cerulean City. There, Misty will be dating a strange man. Misty will then return to the Gym where you can battle her.
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.)