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Once you've beaten the Cinnabar Gym, Bill will show up and ask you to accompany him to One Island. When you reach the island, head east, and then Surf north; you will reach a large patch of land with a cave near the north end. In the cave, the Ember Spa, one of the old men will give you the HM for Rock Smash.

Since it is possible to do all of the above without conquering the Saffron Gym (and the Celadon and Vermilion Gyms, for that matter), I should note that you need the Marsh Badge to use Rock Smash outside of battle.

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11y ago

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