These are the Hm moves you need.
Fly, Surf, Rocksmash, Flash, Dive and Waterfall.
Fly to sootopalis and surf west then east a little and use dive. Then go out the door underwater, use dive and surf east. And then find a waterfall. Use waterfall and go through victory road.
Go to sunyshore city, then go up in the water (make sure you got surf and waterfall) to swim and to go up the waterfall to The Pokemon League then you will reach a Pokemon league cave past it and then go to the Pokemon league heal your Pokemon and fight
surf around the pokemon league
in the Pokemon league. Yes, it is but you have to go through a cave to get to it. Look on your map.
go to the Pokemon league
to the Pokemon league.
go to the Pokemon league
You can't really go further then that. The pokemon league contains the toughest trainers in pokemon platinum.
first beat the elite4 then go to Pokemon league
u go to the place
back to the Pokemon league
Go to the Pokemon league.
Go to the Pokemon league