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i mean there isn't any sun light....

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It can be used anyway. The game isn't fully based upon the Earth, and besides...that would be a bit stupid...
BTW this still applies for Sunny Day too, Solar Beam is a one turn move if sunny day is active.

http://bulbapedia.bulbagarden.net/wiki/SolarBeam_(move)

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Yes.I have used solarbeam before in a cave before.If you use sunny day though it will be a one turn move.

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