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Deals damage. Provided the move hits, the user must recharge the following turn, and may not attack or switch.
Scald, Surf, and Hydro Pump are all excellent alternatives to this dud attack. The recharge turn is simply not worth the extra Base Power; save Hydro Cannon for in-game fun.
Scald is a much less powerful alternative with greater accuracy and a chance to burn the opponent, which does not have a recharge turn.
Surf is a less powerful alternative with greater accuracy, which does not have a recharge turn.
Hydro Pump is a less powerful and less accurate alternative, which does not have a recharge turn.