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I need a few more Pokémon in the Castelia Sewers to complete the habitat dex for the area, but I can’t find any water. The game is Black 2, if that makes a difference.

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Probably the reason you can't find any water is because it's Autumn or Winter. During these seasons, the Sewers are completely dry. This prevents the use of Fishing and Surfing in the Sewers.
Source: https://m.bulbapedia.bulbagarden.net/wiki/Castelia_Sewers
This also features a layout of the Sewer for reference.
Hopefully this is what you wanted.

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yep, it’s Autumn in my game.
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During autumn and winter, the sewers are dry, blocking some areas and removing the requirement of Surf to access others.

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