Outcast Island — Pokémon Aesthetic Red
Every wild Pokémon here, by encounter method.
Outcast Island lists 13 Pokémon across 5 encounter methods (surf, old rod, good rod, super rod, and more). One of them is on no other route's wild tables in this guide: Raikou.
Outcast Island 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: