Route 18.
In the Ice Path.
squirtlewarturtleblastoisepsyduckgolduckpoliwagpoliwhirlpoliwrathtentacooltentacruelseeldewgonghorseaseadragoldeen seakingstaryustarmiegyradoselaprasvaporeonomanyteomasterkabutokabutopsmewchinchoulanturnmarillazumarillpolitoedquagsireslowkingqwillfishremoraidoctillareekingdrasuicune My Lapras and Gyrados Know the move waterfall
Most water type Pokemon can learn the move Waterfall.
Iris is found in both Black and White, but you can only face her as a a Gym Leader in Pokemon White version. In Black version, she is just a civilian who can teach your Pokemon the move Draco Meteor.
Hm08 is rock climb not waterfall. Hm07 is the move waterfall
HM, Waterfall is in the Ice Cave on Four Island.
In Pokémon White 2, the move Waterfall can be obtained as a TM (TM99). You can find it in the cave known as the "Cave of Being," which is located on Route 21. After defeating the Elite Four and becoming the Champion, you can access this area and retrieve the TM from a location inside the cave.
jasmine at the beachnorth in sunyshore city.
HM7 contains the move Waterfall.
Try either kingdra or feraligatr, they are absolute pwnage in battle and waterfall is a good move for them
HM08 Waterfall is in the Cave of Origin in Sootopolis City.
not a TM any more Pokemon like scolipede learn it by leveling up and is not a field move