21highest level
Fought at Sea Route 41.
This is around Beat Morty — Ecruteak City Gym, badge 4 in the story — that page lists everything you can have caught by this point.
Types on this team: Water ×3Poison ×2
| Pokémon | Moves | |
|---|---|---|
 | Shellder Lv 21 · Skill Link | Supersonic Icicle Spear Protect Leer |
 | Tentacool Lv 19 | Constrict Acid Toxic Spikes Bubble Beam |
 | Tentacruel Lv 19 · Liquid Ooze | Constrict Acid Toxic Spikes Bubble Beam |