In HeartGold, you can find the HM Waterfall in the Ice Cave.
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Most water type Pokemon can learn the move Waterfall.
Feraligatr cannot learn Waterfall in Pokémon Gold and Silver, additionally it cannot be taught it via the HM.
squirtlewarturtleblastoisepsyduckgolduckpoliwagpoliwhirlpoliwrathtentacooltentacruelseeldewgonghorseaseadragoldeen seakingstaryustarmiegyradoselaprasvaporeonomanyteomasterkabutokabutopsmewchinchoulanturnmarillazumarillpolitoedquagsireslowkingqwillfishremoraidoctillareekingdrasuicune My Lapras and Gyrados Know the move waterfall
on the ice path
If you start out with totodile as a starter then he can learn waterfall or you could wait till you go to the lake of rage and catch red gyrados and teach him waterfall and if you start out with cyndaquil then when he evolves into quilava or typhlosion then he can learn rock climb. hope this helps from nick oaks