31level cap
Boss Giovanni fields 4 Pokémon between level 29 and level 31 in Rocket Hideout B4F.
This is around Thunder Badge — Rock Tunnel to Celadon City — Lv. 35 cap in the story — that page lists everything you can have caught by this point.
Types on this team: Ground ×2Normal ×2Rock
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Onix Lv 29 RockGround | Ability Rock Head | Dig Rock Tomb Screech Rock Smash | HP75Attack80Defense160Sp. Atk40Sp. Def65Speed90Total510 |
 | Persian Lv 31 Normal | Ability Limber | Slash Cut Water Pulse Thunderbolt | HP65Attack70Defense60Sp. Atk65Sp. Def65Speed115Total440 |
 | Marowak Lv 30 Ground | Ability Rock Head | Bonemerang Cut Rock Smash Take Down | HP65Attack80Defense110Sp. Atk80Sp. Def80Speed45Total460 |
 | Kangaskhan Lv 31 Normal | Ability Early Bird | Fake Out Bite Rock Smash Mega Punch | HP105Attack95Defense80Sp. Atk40Sp. Def80Speed90Total490 |
How to beat this team
Shared weaknesses. Fighting hits 3 of 4, Grass hits 2 of 4, Ice hits 2 of 4, Water hits 2 of 4.
Level to be ready for. Lv 31 — Persian, the highest on the team.
Fighting Pokémon you can have caught by this point. From this guide’s own encounter tables, by Thunder Badge — Rock Tunnel to Celadon City — Lv. 35 cap: