You need the Dragon Badge, which is the very last badge (8th). After you obtain it, you may use Waterfall outside of battle whenever you like. :)
Get the waterfall hm!
you burn the game.
your Pokemon fly off with you in the distance. Then you fall off him/her and fall in to the water. the you beat the game.
I only know 3 moves that makes Pokemon fall asleep. GrassWhistle - Roselia learns it by level up Yawn - Dunsparce learns it by level up Hypnosis - Drowsee knows it when captured in Pokemon Heart gold And Soul silver.
First you go to spear pillar then when u come to room with a small pond and water fall find the entrance to water fall and it should be up there
find the hm (water fall)and search pokemon league and after defeating pokmon league master become pokemon collector and collect every pokemon and then professer will send you to moon by rocket to capture zirchi(pokemon)
Route 18.
it is water fall and it is in ice fall cave
go to icefall cave and it will be in there
Get the waterfall hm!
you burn the game.
goldeen and seaking, around level 39-41
You can find it at Icefall Cave at Four Island.
After defeating the 8th gym talk to the lady on the beach from jhoto she will give you the HM water fall and use it to get to the Pokemon league. Hope I helped
your Pokemon fly off with you in the distance. Then you fall off him/her and fall in to the water. the you beat the game.
Inside, the cave of origins, where you will see groudon.
you talk to wishcash.