The marsh badge is in the saffron city gym you must beat Sabrina the gym leader to get it, but to do that you must beat team rocket in the silph co building.
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The sixth gym badge (the Marsh badge) is located at Saffron City's gym. It is in Gym Leader Sabrina's possession, so you have to defeat her to obtain it.
You get the Marsh badge from defeating Sabrina, who is the gym leader in Saffron City. Sabrina uses psychic Pokemon.
fuschia.
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in Viridian city. the one that was locked.