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Deals damage. Base Power doubles if target has a status ailment.
Hex is an interesting move. If the target has a status condition, the move is stronger than Shadow Ball, but much weaker otherwise. This makes Hex somewhat unreliable, but Ghost-types often run Will-O-Wisp, somewhat alleviating this problem. Toxic Spikes complement this move very well, poisoning the opponent's Pokemon as they enter the battlefield. Hex should be used carefully, and complemented by a reliable secondary move.
Shadow Ball is a more reliable option that also has a 10% chance to lower the opponent's Special Defense by one stage.