Where to find gastrodon in Pokemon black 2?

In Pokémon Black 2, you can find Gastrodon in the following locations: Route 23 and the Surfable areas of the water routes. You can also catch its pre-evolution, Shellos, in the same areas, and it will evolve into Gastrodon at level 30. Be sure to use a fishing rod or Surf to access the water to encounter it.