Pokémon Yellow
Pokémon Yellow

Gym Battle: Brock

Challenge Brock's Geodude and Onix in Pewter City Gym. Use Fighting-type Pokémon with Double Kick or Low Kick to defeat his Rock/Ground types and win the Boulde.

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Enter the Pewter City Gym. There's one junior trainer you can battle before Brock to gain some extra experience. Once ready, challenge Brock. He will use:

Gym Battle: Brock - Pokémon Yellow screenshot
Gym Battle: Brock
  • Geodude (Level 10): Rock/Ground type.
  • Onix (Level 12): Rock/Ground type.

Focus your attacks with your Fighting-type Pokémon (Nidoran with Double Kick or Mankey with Low Kick). If you don't have a Fighting-type, you can try to chip away with Normal-type moves from Pikachu or other Pokémon, but it will be a tough fight. Potions are your friend here. After defeating Brock, he will award you the Boulder Badge and TM34 (Bide).