you sneak into it and Get in there go get a rode and do it
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To move a big boulder you need obtain the move Strength. To use the move outside of battle you need the Rainbow badge.
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 need the rainbow badge which you get a celadon city Hm cut is needed.
You can obtain the 8th gym badge (the earth badge) in fire red from Giovanni in Viridian City.
to get the eight badge go to viridian city after you have 7 badges and enter the gym