"God, you're stupid. It's in your rival's house in Twinleaf town." Is wrong. The guy who answered before me needs to look before answering. The REAL location is in the great marsh (safari game). Right as you go into the great marsh, look to your left. There's a green-haired-dude that will give it to you.
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HM 05 is flash
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.
If u got Pokemon diamond version get the instruction booklet and go to page 34 it will tell u bout the gyms and badges. u get 5th badge in Canalave City Gym Byron Mine badge. Allows u to use hm strength , outside of battle you can unlock canalave city when obtained the hm surf.
you get it at the great marsh and talk to the green haired guy
In Diamond, Badge 5 can be gotten by defeating Fantina in her Gym in Hearthome City.