The sixth gym badge is the Marsh Badge and is obtained when you defeat Sabrina at the Saffron City's Second gym. In order to gain access to this gym, you must first remove Team Rocket's presence in Saffron City by defeating Giovanni.
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For DPPt, the 6th.
You beat the 6th gym leader.
You can obtain the 8th gym badge (the earth badge) in fire red from Giovanni in Viridian City.
Defeat the cinnibar island gym leader.
Defeat the celadon city gym leader.