20highest level
Team Rocket Grunt (3) fields 3 Pokémon at level 20 in Rocket Hideout.
This is around Thunder Badge — Rock Tunnel to Celadon City in the story — that page lists everything you can have caught by this point.
Types on this team: Poison ×3
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Grimer Lv 20 Poison | Minimize Sludge Disable Harden | HP80Attack80Defense50Sp. Atk40Sp. Def50Speed25Total325 | |
 | Koffing Lv 20 Poison | Smog Tackle Poison Gas | HP40Attack65Defense95Sp. Atk60Sp. Def45Speed35Total340 | |
| Koffing Lv 20 Poison | Smog Tackle Poison Gas | HP40Attack65Defense95Sp. Atk60Sp. Def45Speed35Total340 |
How to beat this team
Shared weaknesses. Ground hits 3 of 3, Psychic hits 3 of 3.
Level to be ready for. Lv 20 — Grimer, the highest on the team.
Ground Pokémon you can have caught by this point. From this guide’s own encounter tables, by Thunder Badge — Rock Tunnel to Celadon City: