You need HM07 to teach your Pokemon the move "Waterfall" which allows he/she to swim up the obstacle to the other side. The HM can be found by talking to the man on the "Ice Path".
Chat with our AI personalities
in soul silver
yes trade with a friend
press the red buton to raise the waterfall
go to azalea town then right and down past the hiker right and there it is. :)
get the sprayduck from golden rod flower shop and water it.