Slip and slide!
In the Ice Path
you tell me?
there is no ice path in Pokemon platinum. it's in johto (heart gold/soul silver/gold/silver/crystal)
Just keep on going on and
either the ice path or seafoam island
you have to get through the ice path
MEOW.
you can get swinub at the ice path in johto region.
Use the HM Strength.
push all the boulders down the holes with stength,
Blackthorn City, after Mahogany Town and after Ice Path
you will find waterfall on the 1st floor on ice path