Seafoam Islands — Pokémon Red & Blue
Every wild Pokémon here, by encounter method.
Seafoam Islands lists 18 Pokémon across 17 encounter methods (grass, grass, grass, grass, and more), between level 5 and 50. 4 of them are on no other route's wild tables in this guide: Seel, Golduck, Dewgong, Articuno.
Seafoam Islands in other guides
The same area in other ROM hacks on this site. Each one has its own encounter table.
The original game's table for this area: