Seaward Cave — Pokémon Ultra Sun & Ultra Moon
Every wild Pokémon here, by encounter method.
Seaward Cave lists 12 Pokémon across 7 encounter methods (grass, surf, super rod, bubbling spots, and more), between level 9 and 22. 3 of them are on no other route's wild tables in this guide: Smoochum, Delibird, Squirtle.
Seaward Cave in the official games
The original game's table for this area:
Grass Lv 9-12
Surf Lv 15-18
Super Rod Lv 10-17
Bubbling spots Lv 10-22
Island Scan Lv 12
SOS call Lv 9-18
Jynx20% · Lv 9-12
Happiny20% · Lv 9-12
Zubat20% · Lv 15-18
Gyarados20% · Lv 10-17
Whiscash20% · Lv 10-17