50level cap
Erika (as your 6th badge) fields 5 Pokémon between level 48 and level 50 in Celadon City Gym.
This is around Beat Sabrina — Saffron City Gym, badge 6 in the story — that page lists everything you can have caught by this point.
Types on this team: Grass ×5Poison ×3Psychic
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Tangela Lv 48 Grass | Mega Drain Stun Spore Solarbeam Bind | HP65Attack55Defense115Sp. Atk100Sp. Def100Speed60Total495 | |
 | Victreebel Lv 49 GrassPoison | Razor Leaf Sludge Wrap Swords Dance | HP80Attack105Defense65Sp. Atk100Sp. Def100Speed70Total520 | |
 | Venusaur Lv 48 GrassPoison | Razor Leaf Solarbeam Leech Seed Body Slam | HP80Attack82Defense83Sp. Atk100Sp. Def100Speed80Total525 | |
 | Exeggutor Lv 49 GrassPsychic | Reflect Egg Bomb Psychic Sleep Powder | HP95Attack95Defense85Sp. Atk125Sp. Def125Speed55Total580 | |
 | Vileplume Lv 50 GrassPoison | Leech Seed Petal Dance Sludge Solarbeam | HP90Attack80Defense85Sp. Atk100Sp. Def100Speed50Total505 |
How to beat this team
Shared weaknesses. Fire hits 5 of 5, Flying hits 5 of 5, Ice hits 5 of 5, Psychic hits 3 of 5.
Level to be ready for. Lv 50 — Vileplume, the highest on the team.
Fire Pokémon you can have caught by this point. From this guide’s own encounter tables, by Beat Sabrina — Saffron City Gym, badge 6:
- 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