well she isn't a boss.
shes the gym leader.
you have to beat the twoer of team rocket
then go into her gym and beat the pattern of teleporter pads.
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from Sabrina in saffron city
Sabrina, a phsycic type leader
The sixth gym leader,Sabrina, is in Saffron City.
you have to beat the team rocket boss giovani. he will be in the biggest building insaffron city. then you will be given a master ball and team rocket will leave the city. then go to the gym and beat sabrina. but be careful, she uses psychic pokemon.
You get the Marsh badge from defeating Sabrina, who is the gym leader in Saffron City. Sabrina uses psychic Pokemon.