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Deals damage and has a 50% chance to lower the target's accuracy by one stage.
Not the most useful move, as the only users are Octillery and Kingdra, and both Pokemon have better things to do with that slot. The low Base Power is a big factor in explaining this move's lack of use, but not the only one. It simply doesn't hit hard enough and reducing the target's accuracy is not a reliable strategy. Most battlers would prefer to use a more powerful Water-type attack like Surf or Hydro Pump right from the start.
Surf is a more powerful and accurate alternative.
Hydro Pump is a much more powerful but less accurate alternative.
Mirror Shot is a Steel-type equivalent.
Mud Shot is a Ground-type equivalent.