60highest level
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: GroundRock
| Pokémon | Moves | |
|---|---|---|
 | Onix Lv 60 · Rock Head · Leftovers Postgame. Its level is set to match your lead Pokémon when the fight starts; the stored level is shown · Adamant nature · EVs 4/252/252/0/0/0 | Earthquake Iron Tail Torment Screech |