19level cap
Team Rocket Jessie & James (Mt. Moon) fields 3 Pokémon between level 18 and level 19 in Mt. Moon.
This is around Boulder Badge — Mt. Moon and Cerulean City in the story — that page lists everything you can have caught by this point.
Types on this team: Poison ×2Normal
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Ekans Lv 18 Poison | Ability Intimidate Held item Black Glasses Adamant nature | Leer Secret Power Bite Poison Fang | HP45Attack65Defense44Sp. Atk50Sp. Def54Speed60Total318 |
 | Koffing Lv 18 Poison | Ability Levitate Held item Poison Barb Bashful nature | Poison Gas Tackle Smog Selfdestruct | HP50Attack70Defense95Sp. Atk75Sp. Def45Speed35Total370 |
 | Meowth Lv 19 Normal | Ability Pickup Held item Silk Scarf Jolly nature | Slash Water Pulse Aerial Ace Facade | HP40Attack45Defense35Sp. Atk40Sp. Def40Speed90Total290 |
How to beat this team
Shared weaknesses. Ground hits 2 of 3, Psychic hits 2 of 3, Fighting hits 1 of 3.
Level to be ready for. Lv 19 — Meowth, the highest on the team.
Ground Pokémon you can have caught by this point. From this guide’s own encounter tables, by Boulder Badge — Mt. Moon and Cerulean City: