21level cap
Misty fields 3 Pokémon between level 18 and level 21 in Cerulean City Gym.
This is around Boulder Badge — Mt. Moon and Cerulean City — Lv. 21 cap in the story — that page lists everything you can have caught by this point.
Types on this team: Water ×3Psychic
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Poliwhirl Lv 18 Water | Ability Water Absorb | Water Pulse Mega Punch Karate Chop | HP65Attack65Defense65Sp. Atk50Sp. Def50Speed90Total385 |
 | Goldeen Lv 20 Water | Ability Swift Swim | Horn Attack Peck Waterfall | HP45Attack67Defense60Sp. Atk35Sp. Def50Speed63Total320 |
 | Starmie Lv 21 WaterPsychic | Ability Natural Cure | Swift Confusion Water Pulse | HP60Attack75Defense85Sp. Atk100Sp. Def85Speed115Total520 |
How to beat this team
Shared weaknesses. Electric hits 3 of 3, Grass hits 3 of 3, Bug hits 1 of 3, Dark hits 1 of 3.
Level to be ready for. Lv 21 — Starmie, the highest on the team.
Electric Pokémon you can have caught by this point. From this guide’s own encounter tables, by Boulder Badge — Mt. Moon and Cerulean City — Lv. 21 cap: