The Pewter City Gym is the first Pokemon Gym you can challenge in the game. Each Gym in the game has a requirement you must meet before you can challenge the Trainers and Gym Leader. Defeat the Gym Leader to earn a Gym Badge.
The Pewter City Pokemon Gym specializes in Rock-type Pokemon. The requirement for challenging this gym is to have a grass- or water-type Pokemon in your party. Grass-type Pokemon can be found on routes 1 and 2 and the Viridian Forest. Use grass- and water-type attacks to deal massive damage. Ground- and fighting-type attacks will also work against these monsters. The first two Trainers can be challenged back to back or avoided by taking the side paths.
Picknicker Amara
| Geodude ♀ | Lv.7 | Type | Rock/Ground |
|---|---|---|---|
 |
|||
| Tackle | Defense Curl | ||
| Normal | Physical | Normal | Status |
| Sand Attack | Bide | ||
| Ground | Status | Normal | Physical |
Camper Liam
| Geodude ♂ | Lv.7 | Type | Rock/Ground |
|---|---|---|---|
|
|||
| Tackle | Defense Curl | ||
| Normal | Physical | Normal | Status |
| Sand Attack | Bide | ||
| Ground | Status | Normal | Physical |
Gym Leader Brock
Brock is the Gym Leader of the Pewter City Gym. His Pokemon are both rock- and ground-type, meaning they are 4x weak to water- and grass-type attacks. You can capture an Oddish/Bellsprout or Bulbasaur and eliminate Brock with minimal effort as long as they are around level 10 and have a grass-type attack.
| Geodude ♂ | Lv.11 | Type | Rock/Ground |
|---|---|---|---|
|
|||
| Tackle | — | ||
| Normal | Physical | — | — |
| Onix ♂ | Lv.12 | Type | Rock/Ground |
|---|---|---|---|
 |
|||
| Headbutt | Bind | ||
| Normal | Physical | Normal | Physical |
| Rock Throw | — | ||
| Rock | Physical | — | — |
Defeat both of Brock’s Pokemon to receive the Boulder Badge, which allows Pokemon up to level 20 to obey you in battle. You will also receive the TM01 Headbutt, a strong normal-type attack. Leave the Gym to run into a familiar kid. He will introduce himself and hand over 5 Great Balls.
After obtaining the Boulder Badge, a few new items will become available at the Poke Mart. The next step in your adventure is Route 3