You go to Sunyshore and challenge their gym.
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Right outside the house u find MH07 (the long snowy route to Snowpoint city) There u will find the item.
HM08 (Rock Climb) is in Route 217 (south of Snowpoint) behind the man's house. After talking to the man in the house after getting the HM, he should give you an Icicle Plate.
how to get a togepi in Pokemon platinum
There is no grunt that you can give a Pokemon to in Pokemon platinum.
That pokemon is Azumarill in pokemon platinum in the national pokedex