Melemele Sea — Pokémon Heart & Soul
Every wild Pokémon here, by encounter method.
Melemele Sea lists 10 Pokémon across 4 encounter methods (surf, old rod, good rod, super rod), between level 43 and 45.
Melemele Sea in the official games
The original game's table for this area:
Opens up at Beat Leader Blue — Viridian City Gym, badge 16. 1 trainer here: