How to Defeat the Rock Gym in FR/LG: A Complete Tutorial

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A simple walkthrough to help you achieve victory (and TM Rock Tomb)
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The Pewter gym is your first major stop as you embark on your journey to become the Pokémon Champion in Pokémon FireRed or LeafGreen. Beating gym leader Brock and his two rock Pokémon isn’t too challenging, but what if you chose Charmander as your starter, rather than Squirtle or Bulbasaur? We’re here to help. Read on for a step-by-step guide on how to beat Brock and earn the Boulder Badge, and learn more about the other gym leaders you can expect to battle further down the line.

Things You Should Know

  • Fight with Pokémon that are naturally strong against Rock-type Pokémon, like Squirtle or Bulbasaur.
  • Alternatively, level up your Charmander to 13 so it learns Metal Claw, and/or evolve a Caterpie into Metapod and then Butterfree so it learns Confusion.
  • Prepare to fight Water-, Electric-, Grass-, Poison-, Psychic-, Fire-, and Ground-Type gyms after you defeat Brock (in that order).
Section 1 of 3:

How to Beat Brock

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    The Pewter gym is led by Brock, who fights solely with Rock-type Pokémon—a Geodude and an Onix, to be exact. [1] To take down these Pokémon, fill your team with Pokémon that know Fighting-, Steel-, Water-, Ground- and/or Grass-type moves. [2]
    • If you started with Squirtle or Bulbasaur, you’re already in great shape. By level 7, Squirtle already knows Bubble, a Water-type move. [3] Similarly, Bulbasaur learns Leech Seed, a Grass-type move, once it hits level 7. [4]
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    Brock’s Geodude is level 12, while his Onix is level 14. [5] Level your Pokémon (at least the one you plan on attacking with) to level 12 so they can generate more powerful hits against Brock’s Pokémon.
    • “Grinding” simply involves fighting wild Pokémon over and over again to gain XP and level up your Pokémon. Route 1, Route 22, Route 2, and the Viridian Forest are all potential spots where you can farm your Pokémon before fighting Brock. [6]
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    The Pewter gym only has 1 challenger aside from Brock—his name is Camper Liam, and he’ll challenge you with his level 10 Geodude and his level 11 Sandshrew. As a Ground-type Pokémon, Sandshrew is especially weak to Water-, Ice-, and Grass-type moves, but you can easily take it down with a variety of other moves (as long as they aren’t Poison, Rock, or Electric). [7]
    • If any of your Pokémon get hurt during this battle, heal them up with Potions before fighting Brock.
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    Rock-type Pokémon (like Geodude and Onix) are weak to Grass-, Steel-, Water-, Ground-, and Fighting-type moves, so start up the battle with your Pokémon that’s loaded up with one of these ability types. [8] A few good Pokémon abilities to consider include:
    • Squirtle’s Bubble
    • Bulbasaur’s Leech Seed
    • Charmander’s Metal Claw
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    Once you’ve successfully knocked out Geodude and Onix, Brock will award you the Boulder Badge—this proves that you’ve beaten the Pewter Gym, and also lets you use the HM05 Flash anytime you’d like (not just in a battle). [9] He also gives you Rock Tomb, a special offensive Rock-type ability. [10]
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Section 2 of 3:

Helpful Pokémon to Use

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    Explore the Viridian Forest until you stumble upon and catch a Caterpie (a Bug-type Pokémon). Continue battling other wild Pokémon to level up your Caterpie and evolve it into a Metapod (at level 7) and then a Butterfree (at level 10). At level 10, Butterfree learns Confusion, an ability that can be effective against Brock’s Pokémon. [11]
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    Head over to Route 22; believe it or not, this area is accessible before the Pewter gym. Wander around the grass until you find and catch a Mankey. [12] At levels 6 and 12, Mankey respectively learns Low Kick and Karate Chop, two Fighting-type abilities that’ll do a lot of damage to Brock’s Pokémon. [13]
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    Yes, Charmander’s Ember attack isn’t very powerful against Rock-type Pokémon. If you get him to level 13, however, he will learn Metal Claw, a Steel-type move that’s naturally strong against Rock Pokémon. [14]
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Section 3 of 3:

Other LeafGreen and FireRed Gym Leaders

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    As the second leader of the Kanto region, Misty’s team consists of a level 18 Staryu (Water) and a level 21 Starmie (Water/Psychic). [15] Water-type Pokémon don’t hold up well against Grass- or Electric-type Pokémon, so be sure to battle Misty with Pokémon that have these abilities in their move set. [16]
    • Tip: Find TM09 Bullet Seed (a Grass-type ability) on the first floor of Mt. Moon and equip it on Bulbasaur or Paras (a Pokémon that can also be found in Mt. Moon). [17]
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    Lt. Surge, the Electric-type gym leader, features a level 21 Voltorb (Electric), a level 18 Pikachu (Electric), and a level 24 Raichu (Electric) on his roster. [18] Electric-type Pokémon are super weak to Ground-type moves, so keep that in mind before you challenge him. [19]
    • Tip: Use Geodude as a key player in your battle. As a dual Rock-Ground-type Pokémon, Geodude should have Ground-type abilities like Mud Sport and Magnitude by the time it’s level 16 or higher. [20]
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    Erika is the game’s Grass-type gym leader who fights with a level 29 Victreebel (Grass/Poison), a level 24 Tangela (Grass), and a level 29 Vileplume (Grass/Poison). [21] Not to worry, though—Grass-type Pokémon are weak to a variety of different Pokémon types, including Fighting, Fire, Poison, Flying, Bug, and Ice. [22]
    • Tip: Poison/Grass-type Pokémon like Vileplume and Victreebel won’t be as hurt by Poison-, Bug-, and Fighting-type Pokémon, but they are still weak to Ice-, Fire-, and Flying-type Pokémon, as well as Psychic-type.
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    Koga is the leader of the Poison-type gym, and fights with a level 37 Koffing (Poison), a level 39 Muk (Poison), a level 37 Koffing, and a level 43 Weezing (Poison). [23] Ground- and Psychic-type Pokémon pack an especially powerful punch against Koba’s team, so be sure to equip these types of Pokémon on your team. [24]
    • Tip: Head through Diglett’s cave to catch either a Diglett or Dugtrio. [25] These Ground-type Pokémon can definitely give you an edge in battle!
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    As the Psychic-type gym leader, Sabrina faces off using a level 38 Kadabra (Psychic), a level 37 Mr. Mime (Psychic), a level 38 Venomoth (Bug/Poison), and a level 43 Alakazam (Psychic). [26] Make sure some of your Pokémon have Dark-, Bug-, and/or Ghost-type attacks equipped, which do extra damage to Psychic types. [27]
    • Tip: Be sure to have a Pokémon on your team that can handle Venomoth! This dual-type Pokémon takes a lot of damage from Psychic-, Fire-, Rock-, and Flying-type abilities.
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    Blaine, the leader of the Fire-type gym, battles with a level 42 Growlithe (Fire), a level 40 Ponyta (Fire), a level 42 Rapidash (Fire), and a level 47 Arcanine (Fire). [28] Water-, Rock-, and Ground-type attacks are all super effective against Fire-type Pokémon, so be sure to plan your team accordingly. [29]
    • Tip: Bust out the TM03 Water Pulse that Misty gave you if you don’t have a lot of Water-type attacks on hand—it’ll come in handy during this gym battle.
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    Giovanni, the final gym leader you have to face, features a team full of Ground-type Pokémon: a level 45 Rhyhorn (Ground/Rock), a level 42 Dugtrio (Ground), a level 44 Nidoqueen (Ground/Poison), a level 45 Nidoking (Poison/Ground), and another level 50 Rhyhorn. [30] Water-, Ice-, and Grass-type Pokémon all do a lot of damage against Ground-type Pokémon, so make sure your Pokémon roster is up to the task. [31]
    • Tip: Save your game before fighting Giovanni (and any other gym leader, if you want to be safe). If your team gets wiped out, simply reboot your game and start over!
    • Once you beat all the gyms, you can progress to fighting the Elite Four .
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  • Question
    How do you beat the other gym?
    Community Answer
    For the rock gym, Charmander learns iron claw at level 13 if you are patient enough. With Squirtle and Bulbasaur, you will get a grass/water move very early on.
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  • Question
    Does this work for Pokemon ed for Game Boy color?
    Community Answer
    Almost. But in red, Charmander can't learn metal claw because steel type doesn't exist in gen.1.
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  • Question
    How many times can Geodude and Onix use Defense Curl?
    Community Answer
    It's random. If you are lucky enough, they can use it even only once. After about six uses, this move will became useless.
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      References

      1. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      2. ↑ https://www.dexerto.com/pokemon/rock-type-pokemon-weaknesses-resistances-1968723/
      3. ↑ https://www.serebii.net/pokedex-rs/007.shtml
      4. ↑ https://www.serebii.net/pokedex-rs/001.shtml
      5. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      6. ↑ https://bulbapedia.bulbagarden.net/wiki/Appendix:FireRed_and_LeafGreen_walkthrough/Section_1
      7. ↑ https://bulbapedia.bulbagarden.net/wiki/Pewter_Gym#Pok.C3.A9mon_FireRed_and_LeafGreen
      8. ↑ https://www.dexerto.com/pokemon/rock-type-pokemon-weaknesses-resistances-1968723/
      9. ↑ https://pokemon.fandom.com/wiki/Gym_Badges#Johto_League
      1. ↑ https://guidestrats.com/pokemon-frlg-tm39-rock-tomb/
      2. ↑ https://www.serebii.net/pokedex-rs/010.shtml
      3. ↑ https://bulbapedia.bulbagarden.net/wiki/Appendix:FireRed_and_LeafGreen_walkthrough/Section_1
      4. ↑ https://www.serebii.net/pokedex-rs/056.shtml
      5. ↑ https://www.serebii.net/pokedex-rs/004.shtml
      6. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      7. ↑ https://www.charlieintel.com/pokemon/water-type-pokemon-weaknesses-counters-and-resistances-200552/
      8. ↑ https://bulbapedia.bulbagarden.net/wiki/Appendix:FireRed_and_LeafGreen_walkthrough/Section_2
      9. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      10. ↑ https://www.dexerto.com/pokemon/electric-type-pokemon-weaknesses-resistances-1886459/
      11. ↑ https://www.serebii.net/pokedex-rs/074.shtml
      12. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      13. ↑ https://outsidergaming.com/pokemon-grass-pokemon-weaknesses/
      14. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      15. ↑ https://dotesports.com/pokemon/news/all-poison-type-pokemon-weaknesses-explained
      16. ↑ https://bulbapedia.bulbagarden.net/wiki/Appendix:FireRed_and_LeafGreen_walkthrough/Section_5
      17. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      18. ↑ https://www.dexerto.com/pokemon/psychic-type-pokemon-weaknesses-resistances-1803646/
      19. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      20. ↑ https://dotesports.com/pokemon/news/all-fire-type-pokemon-weaknesses-explained
      21. ↑ https://www.serebii.net/fireredleafgreen/gyms.shtml
      22. ↑ https://www.dexerto.com/pokemon/ground-type-pokemon-weaknesses-resistances-1886433/

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