In the ice path outside of mohagany town on the way to blackthorn
you will have to find the man in ice path talk to him and then he will give you hm water fall
well when you get to ice path there is a wield chain of combos but there is something you need and that is the HM Water Fall you will need it because when you get to lugia you have to climb a water fall.
That HM is not in the game. I'm sorry
ice path
go to jocose town
you get it on Route 36.
There is a move deleter who can make pokemon forget HM moves.
you have to get hm whirlpool
It ain't a move its an ability.
HM 02 Fly is with the woman outside Cianwood City Gym.
You don't you have to use an Hm on a Pokemon
HM07 Waterfall is found on the Ice Path.