At the western edge of Route 18.
HM Waterfall can be found on Route 18 in Pokemon Black and White.
get it from the champion
to bad
Route 18.
yes
It's on route 18
On route 18
on route 18
route 18
the very end of rout 18
you get it in route 18
get hm waterfall on route 18 and use it up the waterfall in lostlorn