Firstly, Surf is not the problem. Hydro Cannon makes you recharge and that is bad in so many different ways. Cut is plain awful. Lugia shouldn't have more than one Water type moves, as that is unnecessary and you could have moves of other types to cover other types (e.g Aeroblast, Ice Beam, Psychic). Having 4 water moves only lets you hit Fire, Rock and Ground super effectively. Not good