First you need to get all 8 Johto Badges, then beat the Elite Four. Once the credits are over, you can take the ship from Olivine to Vermilion City in Kanto. When you get to Cerulean City, Misty is below where Bill's house is with a strange guy she's apparently on a date with. When they see you, the guy runs away, Misty gets mad and confronts you. Then you're able to battle her at her Gym for the Cascadebadge.
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Go out to route 25 and misty will be there when u get to the end. When she and her boyfriend see u, misty will go back to the gym for u to battle.
If you can trade Pokemon from crystal version to gold version my guess is yes
in cerulean city in the gym idiots
A fake version of Pokemon gold
north of misty's gym in cerulean city