43level cap
Koga fields 4 Pokémon between level 37 and level 43 in Fuchsia City Gym.
This is around Rainbow Badge — the sea routes and Fuchsia City in the story — that page lists everything you can have caught by this point.
Types on this team: Poison ×4
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Koffing Lv 37 Poison | Selfdestruct Sludge Smokescreen Toxic | HP40Attack65Defense95Sp. Atk60Sp. Def45Speed35Total340 | |
 | Muk Lv 39 Poison | Minimize Sludge Acid Armor Toxic | HP105Attack105Defense75Sp. Atk65Sp. Def100Speed50Total500 | |
| Koffing Lv 37 Poison | Selfdestruct Sludge Smokescreen Toxic | HP40Attack65Defense95Sp. Atk60Sp. Def45Speed35Total340 | |
 | Weezing Lv 43 Poison | Tackle Sludge Smokescreen Toxic | HP65Attack90Defense120Sp. Atk85Sp. Def70Speed60Total490 |
How to beat this team
Shared weaknesses. Ground hits 4 of 4, Psychic hits 4 of 4.
Level to be ready for. Lv 43 — Weezing, the highest on the team.
Ground Pokémon you can have caught by this point. From this guide’s own encounter tables, by Rainbow Badge — the sea routes and Fuchsia City: