Most water type Pokemon can learn the move Waterfall.
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No it doesn't, it learns it by move tutor in Blackthorn City
squirtlewarturtleblastoisepsyduckgolduckpoliwagpoliwhirlpoliwrathtentacooltentacruelseeldewgonghorseaseadragoldeen seakingstaryustarmiegyradoselaprasvaporeonomanyteomasterkabutokabutopsmewchinchoulanturnmarillazumarillpolitoedquagsireslowkingqwillfishremoraidoctillareekingdrasuicune My Lapras and Gyrados Know the move waterfall
In HeartGold, you can find the HM Waterfall in the Ice Cave.
on the ice path
in Azalea town you can find and little pond with a rock waterfall. if you surf in it you can find poliwirls, which evolve into fighting types.