Yes, you can.
She's a gym leader in Cerulean, so you have to battle her.
First you beat the Jhoto region then surf over to the Kanto region and fight brock then after going thru the mountain you go to Bills lab/house and then after the side thing you can fight misty
misty
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.
It is still in Cerulean City. However, you can only battle her after solving the problem at the Power Plant. After that, you will find her on the bridge in front of Bill's Grandfather's house. Talk to her, and she will return to the gym and battle you.
First of all, i need to tell you that you can also conquer the kanto region in HG and SS too..... you need to defeat the last gym leader in johto, and i think she,ll give you waterfall to get trough tohjo falls..... ( it,s a cave when you took you,r first step on kanto ) after you have done that, go battle brock the first gym leader in kanto. the 2nd gym is misty in cerulean city and that's when you see her......... GOOD LUCK ON ALL THAT! HOPE I HELPED :)
You can go and challenge other Gym Leaders in the Kanto region, such as Brock.
You can find Misty in Pokémon Crystal in Kanto Region. You will find her north of Cerulean City where she is with the man she is dating.
When you finished the main game, you will be granted access to the S.S. Anne (think it is called tht) After tht u will be able to journey through Kanto and you will eventually be able to battle Misty
go to the kanto region to route 14 where the wind mills are and suicune will be on the lake and then it will be at cerulean cape where misty was
go to the end of route 25 in kanto and misty will be there.
After you beat the elite 4 and go to the kanto region outside Bills house on route 25 after you beat Misty's gym
No, since Misty chose to stay back in Kanto, she will not be in Pokemon Platinum.