Defeat Brock at the Pewter City Gym.Your best chance is to catch a nidoran and train it until it leans double kick,which is super effective against rock types.
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you sneak into it and Get in there go get a rode and do it
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)
To move a big boulder you need obtain the move Strength. To use the move outside of battle you need the Rainbow badge.
Get the Thunder Badge And Talk To Jenny And She Will Give You One
Strength will activate when you get the RainbowBadge.