Pokémon Ruby and Sapphire/Route 106

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Route 106 is, more water, and more trainers.

As soon as you can, get to the sandy beach to the south, because after Douglas there isn't anything interesting in the water. There is, however, a Protein on the beach.

Pokémon found (water)
Sapphire Encounter Rate Ruby Encounter Rate
Magikarp
Tentacool
Wingull
Pelipper
Wailmer