Phase 1 section
Pokemon Yellow Pewter City and Pewter Gym Walkthrough
Pewter City and Pewter Gym section for the Pokemon Yellow walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.
Clear Pewter Gym and earn the Boulder Badge. This page is a standalone section for Phase 1: Boulder Badge, with source-backed Yellow encounter, trainer, item, hidden item, and boss data.
Source maps
Pewter City, Museum 1F, Museum 2F, and Pewter Gym.
Wild rows0 Trainers2 Items2
Route plan
Do not rush Brock with only Pikachu. Train Butterfree for Confusion/status, bring Potions, and use Route 22 backup if Pikachu is still your only reliable attacker.
Wild Pokemon
No wild Pokemon are sourced for this section.
Trainers
| Route order | Trainer | Team | Reward | Optional / rematch note |
|---|---|---|---|---|
| 1. Pewter Gym (4, 1) |  BrockParty #1 | $1,188 | One-time trainer; no rematch in Yellow. | |
| 2. Pewter Gym (3, 6) |  Jr. Trainer MParty #1 | $180 | One-time trainer; no rematch in Yellow. |
Items And Hidden Items
| Item | Type | Area / direction | Coordinate | Requirement |
|---|---|---|---|---|
| Old Amber | Key item | Return with Cut and enter the museum's side door. | - | Return with Cut and enter the museum's side door. |
| TM34 Bide | Gym reward | Defeat Brock. | - | Defeat Brock. |
Boss Strategy
| Boss / branch | Team | Reward | Danger notes | Practical counters |
|---|---|---|---|---|
| BrockBrock | $1,188 | Geodude and Onix have high Defense for this point, and starter Pikachu's Electric moves do not help. | Use Butterfree's Confusion/status, Nidoran Double Kick after enough levels, Mankey from Route 22, Potions, and careful Sand-Attack/Growl support. |
Completion Checklist
- Beat the Gym trainer.
- Defeat Brock.
- Note Old Amber for later Cut access.
- Verify the Yellow encounter rows before leaving if you are filling the Pokedex.
- Use the item rows as a visible-item and hidden-item sweep before moving to the next section.
Sources
pret/pokeyellow: wild encounters, trainer parties, trainer money, map object events, hidden event items, rods, trades, and prize Pokemon.- Encounter odds aggregate the Gen I ten-slot rates: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256.
- Yellow has no day/night encounter column; tables use Game, Method, and Condition instead.