Pokemon Pearl. Heading north to the ice gym but I'm stuck. Help?

Midnight

New member
I am trying to head north to challenge the gym leader who specializes in ice pokemon.
I just went through Celestic town and battled all the trainers there and now I've entered a cave over to the left. All passageways in the cave are blocked by round silver boulders. When I approach these boulders and press A, it says "It's a big boulder, but a Pokemon may be able to push it aside."
Where do I need to go and who do I need to talk to in order to get this move?
Thank you for your time.
 
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