22highest level
Team Rocket Grunt (5) fields 2 Pokémon at level 22 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 ×2
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Grimer Lv 22 Poison | Minimize Sludge Disable Harden | HP80Attack80Defense50Sp. Atk40Sp. Def50Speed25Total325 | |
 | Koffing Lv 22 Poison | Sludge Smog Tackle Poison Gas | HP40Attack65Defense95Sp. Atk60Sp. Def45Speed35Total340 |
How to beat this team
Shared weaknesses. Ground hits 2 of 2, Psychic hits 2 of 2.
Level to be ready for. Lv 22 — 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: