51level cap
Gym Leader Giovanni fields 6 Pokémon between level 50 and level 51 in Viridian City Gym.
This is around Volcano Badge — the Sevii Islands in the story — that page lists everything you can have caught by this point.
Types on this team: Ground ×3Normal ×2Poison ×2ElectricFlyingWater
| Pokémon | Ability & item | Moves | Base stats | |
|---|---|---|---|---|
 | Nidoking Lv 50 PoisonGround | Ability Poison Point Held item Choice Band Hasty nature | Earthquake Sludge Bomb Shadow Ball Megahorn | HP81Attack92Defense77Sp. Atk85Sp. Def75Speed85Total495 |
 | Kangaskhan Lv 50 Normal | Ability Early Bird Held item Silk Scarf Quiet nature | Shadow Ball Fake Out Earthquake Double-Edge | HP105Attack95Defense80Sp. Atk40Sp. Def80Speed90Total490 |
 | Nidoqueen Lv 50 PoisonGround | Ability Poison Point Held item Quick Claw Lax nature | Earthquake Shadow Ball Thunderbolt Ice Beam | HP90Attack82Defense87Sp. Atk75Sp. Def85Speed76Total495 |
 | Gyarados Lv 50 WaterFlying | Ability Swift Swim Held item Shell Bell Lonely nature | Dragon Dance Earthquake Hydro Pump Fly | HP90Attack120Defense79Sp. Atk65Sp. Def95Speed81Total530 |
 | Persian Lv 51 Normal | Ability Compound Eyes Held item Qualot Berry Naughty nature | Double-Edge Hypnosis Shadow Ball Water Pulse | HP75Attack90Defense60Sp. Atk90Sp. Def75Speed115Total505 |
 | Sandy Shocks Lv 51 ElectricGround | Ability Static Held item Leftovers Naughty nature | Earthquake Mirror Coat Thunderbolt Signal Beam | HP75Attack91Defense87Sp. Atk121Sp. Def85Speed101Total560 |
How to beat this team
Shared weaknesses. Ground hits 3 of 6, Ice hits 3 of 6, Water hits 3 of 6, Fighting hits 2 of 6.
Level to be ready for. Lv 51 — Persian, the highest on the team.
Ground Pokémon you can have caught by this point. From this guide’s own encounter tables, by Volcano Badge — the Sevii Islands: