45level cap
Koga (if you beat Sabrina first) fields 3 Pokémon at level 45 in Fuchsia City Gym.
This is around Rainbow Badge — Pokémon Tower and Fuchsia City in the story — that page lists everything you can have caught by this point.
Types on this team: Poison ×3BugFlying
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Venomoth Lv 45 BugPoison | Ability Tinted Lens Held item Wide Lens Hasty nature · EVs 160 HP / 120 SpA / 28 SpD / 200 Spe | Sleep Powder Sludge Bomb Giga Drain Bug Buzz | HP70Attack65Defense60Sp. Atk90Sp. Def75Speed90Total450 |
 | Muk Lv 45 Poison | Ability Poison Touch Held item Black Sludge Careful nature · EVs 160 HP / 120 Atk / 28 Def / 200 SpD | Poison Jab Knock Off Protect Toxic | HP105Attack105Defense75Sp. Atk65Sp. Def100Speed50Total500 |
 | Crobat Lv 45 PoisonFlying | Ability Inner Focus Held item Sitrus Berry Adamant nature · EVs 40 HP / 252 Atk / 36 Def / 80 SpD / 100 Spe | Cross Poison Acrobatics Leech Life Substitute | HP85Attack90Defense80Sp. Atk70Sp. Def80Speed130Total535 |
How to beat this team
Shared weaknesses. Psychic hits 3 of 3, Rock hits 2 of 3, Electric hits 1 of 3, Fire hits 1 of 3.
Level to be ready for. Lv 45 — Venomoth, the highest on the team.
Psychic Pokémon you can have caught by this point. From this guide’s own encounter tables, by Rainbow Badge — Pokémon Tower and Fuchsia City: