Part 2: Beat Brock — Pewter City Gym, badge 1
Beat Brock — Pewter City Gym, badge 1 opens 17 areas. There are 71 trainers standing in them. The fights at this checkpoint are Rival Blue (Charmander), Brock.
Where to go
Route 3
Wild: Spearow 55% · Lv 8-12, Mankey 15% · Lv 9, Rattata 15% · Lv 10-12, Sandshrew 15% · Lv 8-10 +1 more
Trainers: Bug Catcher Lv 10, Bug Catcher #2 Lv 9, Bug Catcher #3 Lv 11, Lass Lv 9, Lass #2 Lv 10, Lass #3 Lv 14 +2 more
Route 4
Wild: Spearow 55% · Lv 8-12, Mankey 15% · Lv 9, Rattata 15% · Lv 10-12, Sandshrew 15% · Lv 8-10 +1 more
Trainers: Lass Lv 31
Pick up: TM04 Whirlwind
Route 5
Wild: Pidgey 40% · Lv 15-17, Rattata 30% · Lv 14-16, Abra 15% · Lv 7, Jigglypuff 10% · Lv 3-7 +1 more
Route 6
Wild: Goldeen 100% · Lv 5-20, Magikarp 100% · Lv 5, Psyduck 95% · Lv 15, Poliwag 50% · Lv 10 +6 more
Trainers: Bug Catcher Lv 16, Bug Catcher #2 Lv 20, Jr Trainer F Lv 16, Jr Trainer F #2 Lv 20, Jr Trainer M Lv 16, Jr Trainer M #2 Lv 16
Route 11
Wild: Magikarp 100% · Lv 5, Tentacool 90% · Lv 10-20, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10 +7 more
Trainers: Engineer Lv 21, Engineer #2 Lv 18, Gambler Lv 18, Gambler #2 Lv 18, Gambler #3 Lv 18, Gambler #4 Lv 18 +4 more
Route 23
Wild: Magikarp 100% · Lv 5, Poliwag 70% · Lv 25-30, Goldeen 50% · Lv 10, Nidorina 30% · Lv 41-44 +5 more
Route 24
Wild: Magikarp 100% · Lv 5, Goldeen 90% · Lv 20-30, Poliwag 50% · Lv 10, Bellsprout 30% · Lv 12-14 +6 more
Trainers: Bug Catcher Lv 14, Jr Trainer M Lv 14, Jr Trainer M #2 Lv 18, Lass Lv 16, Lass #2 Lv 14, Rocket Lv 15 +1 more
Pick up: TM45 Thunder Wave
Route 25
Wild: Magikarp 100% · Lv 5, Krabby 70% · Lv 10-15, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10 +6 more
Trainers: Hiker Lv 15, Hiker #2 Lv 13, Hiker #3 Lv 17, Lass Lv 15, Lass #2 Lv 13, Youngster Lv 15 +2 more
Pick up: TM19 Seismic Toss
Mt. Moon
Wild: Zubat 75% · Lv 6-11, Geodude 20% · Lv 10, Paras 15% · Lv 13, Clefairy 10% · Lv 9-13 +1 more
Trainers: Bug Catcher Lv 11, Bug Catcher #2 Lv 10, Hiker Lv 10, Lass Lv 11, Lass #2 Lv 14, Rocket Lv 13 +5 more
Pick up: TM01 Mega Punch
Diglett's Cave
Cerulean City
Wild: Magikarp 100% · Lv 5, Goldeen 70% · Lv 25-30, Poliwag 50% · Lv 10, Seaking 30% · Lv 30-40 +1 more
Trainers: ★ Rival Blue (Charmander) Lv 18, Rocket Lv 17
Pick up: TM11 Bubble Beam, TM28 Dig
Vermilion City
Wild: Magikarp 100% · Lv 5, Tentacool 90% · Lv 10-20, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10 +4 more
Pick up: TM24 Thunderbolt
S.S. Anne 1F Rooms
Trainers: Gentleman Lv 18, Gentleman #2 Lv 19, Lass Lv 18, Youngster Lv 21
S.S. Anne 2F Rooms
Trainers: Fisher Lv 17, Gentleman Lv 22, Gentleman #2 Lv 17, Lass Lv 20
S.S. Anne B1F Rooms
Trainers: Fisher Lv 17, Sailor Lv 21, Sailor #2 Lv 17, Sailor #3 Lv 18, Sailor #4 Lv 17, Sailor #5 Lv 20
S.S. Anne Bow
Pewter City Gym
Trainers: ★ Brock Lv 12, Jr Trainer M Lv 9
★ Rival Blue (Charmander) — Cerulean City
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Spearow Lv 18 NormalFlying | Peck Growl Leer Fury Attack | HP40Attack60Defense30Sp. Atk31Sp. Def31Speed70Total262 | |
 | Sandshrew Lv 15 Ground | Scratch Sand Attack | HP50Attack75Defense85Sp. Atk20Sp. Def30Speed40Total300 | |
 | Rattata Lv 15 Normal | Tackle Tail Whip Quick Attack Hyper Fang | HP30Attack56Defense35Sp. Atk25Sp. Def35Speed72Total253 | |
 | Eevee Lv 17 Normal | Tackle Tail Whip Sand Attack Growl | HP55Attack55Defense50Sp. Atk45Sp. Def65Speed55Total325 |
★ Brock — Pewter City Gym
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Geodude Lv 10 RockGround | Tackle | HP40Attack80Defense100Sp. Atk30Sp. Def30Speed20Total300 | |
 | Onix Lv 12 RockGround | Tackle Screech | HP35Attack45Defense160Sp. Atk30Sp. Def45Speed70Total385 |
This game's documentation doesn't say where 4 of its 343 fights happen, so those trainers are on no part of this walkthrough; they are all on the Trainers page. It also doesn't say when Kanto Underground Path opens up, so it is in no part above; it has its own route page.