The fourth gym.
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you need the fire badge in lavenderige town kk good luck
The 3rd badge.
You don't need a badge to get strength but you need a badge to use strength and that badge is the rainbowbadge and that is the 4th one in celadon city.
You can use the move strength in Pokémon to move boulders. You can use strength in FireRed after getting the rainbow badge.
The mine badge.