you should use either ground or psychic Pokemon
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In Pokemon Red, the fifth badge is possessed by the Poison-Type Koga. The badge is named Soul Badge. It lets you use Surf outside of Battle.
The 8 badges for Pokemon Red are: Boulder Badge, (Brock) Cascade Badge, (Misty) Thunder Badge, (Lt. Surge) Rainbow Badge, (Erika) Marsh Badge, (Sabrina) Soul Badge, (Koga) Volcano Badge, (Blaine) and Earth Badge. (Giovanni)
You can obtain the 8th gym badge (the earth badge) in fire red from Giovanni in Viridian City.
You need the rainbow badge which you get a celadon city Hm cut is needed.
you sneak into it and Get in there go get a rode and do it