43level cap
Erika (as your 5th badge) fields 4 Pokémon between level 41 and level 43 in Celadon City Gym.
This is around Beat Koga — Fuchsia City Gym, badge 5 in the story — that page lists everything you can have caught by this point.
Types on this team: Grass ×4Poison ×3
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Tangela Lv 41 Grass | Bind Body Slam Sleep Powder Mega Drain | HP65Attack55Defense115Sp. Atk100Sp. Def100Speed60Total495 | |
 | Victreebel Lv 42 GrassPoison | Swords Dance Wrap Razor Leaf Sludge | HP80Attack105Defense65Sp. Atk100Sp. Def100Speed70Total520 | |
 | Venusaur Lv 42 GrassPoison | Razor Leaf Leech Seed Sludge Body Slam | HP80Attack82Defense83Sp. Atk100Sp. Def100Speed80Total525 | |
 | Vileplume Lv 43 GrassPoison | Mega Drain Sleep Powder Petal Dance Sludge | HP90Attack80Defense85Sp. Atk100Sp. Def100Speed50Total505 |
How to beat this team
Shared weaknesses. Fire hits 4 of 4, Flying hits 4 of 4, Ice hits 4 of 4, Psychic hits 3 of 4.
Level to be ready for. Lv 43 — Vileplume, the highest on the team.
Fire Pokémon you can have caught by this point. From this guide’s own encounter tables, by Beat Koga — Fuchsia City Gym, badge 5:
- Ponyta — Route 17, Lv 26
- Magmar — Celadon City, Lv 22
- Growlithe — Route 8, Lv 17
- Charmander — Route 24, Lv 13
- Vulpix — Route 2, Lv 5