Some options that could beat Misty's last Pokemon would be either the Razor Leaf, Vine Whip or Solar Beam attacks.
Only if you beat the Pokemon league.
any dark type move
Basicly after to beat the Rockets in Pokemon Tower in Lavender town the old dude gives you it!
Beat your father and go to wally's house.The man inside should give you the move.
You have you beat the gym leader first
You must beat the last gym leader first.
you have to beat the elite four then beat the champion which is her then she will move.(ive done and i beat the game it took me 3 months to find all the pokemon)
beat the last gym if u have the game search on google not here because these take a while to reach you
fire blast
surf
Only if you beat the Pokemon league.
Beat Byron then get strength and then you can use it.
Beat the Pokemon League
Beat the grunts
any dark type move
beat volkner then talk to jasmine.
A Pokemon that has high special attack and a dragon move like dragonbreath.