you go to the 4th gym leader.
her name is erika.
her strongest Pokemon is a level 29 viloplume.
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It's in Celadon City and you obtain the Rainbow Badge.
You need the rainbow badge which you get a celadon city Hm cut is needed.
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)
the fog badge and the rainbow wing
Get the Thunder Badge And Talk To Jenny And She Will Give You One