Well, it depends because Misty is second in line, but you verse Sabrina after Lt. Surge in HeartGold/SoulSilver, so head to Saffron City after Vermillion
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hes at seafoam islands in kanto
in saffron city gym and her name is Sabrina
actually there isn't 9 gym leader there is only 8 like the other ones. Actually, the 9th gym leader in heartgold and soulsilver would be the first gym leader in Kanto after you beat the elite four the first time, you can face the kanto gym leaders in any order.
If you mean Misty in Cerulean, you have to go along route 25 north of cerulean to the end of the route and she will return to her gym.
fix the power plant