31highest level
Fought at Route 123.
This is around Beat Winona — Fortree City Gym, badge 6 in the story — that page lists everything you can have caught by this point.
Types on this team: Poison
| Pokémon | Moves | |
|---|---|---|
 | Koffing Lv 31 | Toxic Thunder Selfdestruct Sludge Bomb |