As a general statement, which one is more correct?
The pool looked gorgeous in the night.
The pool looked gorgeous at night.
The pool looked gorgeous during the night.
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All three could be grammatically correct in colloquial English depending on the context. Here are some examples, though not exclusive:
The pool looked gorgeous in the night, but in the morning we saw trash at the bottom.
The pool looked gorgeous at night. [This is fine as is, and is the most likely usage.]
The pool looked gorgeous during the night, while lit by the floodlights.
Example 1 implies it might not always look good, and 3 implies a duration. English is flexible, and in this case, there is no intrinsically wrong answer.
Looked gorgeous in the night.... poetic/literary/slightly "heightened" diction.
At night.... normal register
During the night... typically, things happen during the night; things do not seem beautiful during the night. The word "throughout" would probably be a better choice than "during" if you want to link it to looking beautiful.