To my knowledge i don't think there is a waterfall in Pokemon yellow and it is quite irrelevant to the storline if there was one. If you mean a HM named waterfall...i think your on the wrong game, only pearl and diamond have waterfall HM...i think. There are only 5 HM's in Pokemon Yellow Flash, Cut, Fly, Surf, Strength.
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you use waterfall at the Pokemon waterfall or the battlefield.
U don't go through the waterfall, u go over the waterfall. The goal is to have the HM waterfall. This HM allows ur Pokemon to climb the waterfall.
one of your party Pokemon has to know waterfall press A on the waterfall it will say it's a waterfall do you want to use waterfall say yes and you will go up the waterfall
Most water type Pokemon can learn the move Waterfall.
squirtlewarturtleblastoisepsyduckgolduckpoliwagpoliwhirlpoliwrathtentacooltentacruelseeldewgonghorseaseadragoldeen seakingstaryustarmiegyradoselaprasvaporeonomanyteomasterkabutokabutopsmewchinchoulanturnmarillazumarillpolitoedquagsireslowkingqwillfishremoraidoctillareekingdrasuicune My Lapras and Gyrados Know the move waterfall