when you defeat the Pokemon league and get your national pokedex.
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Regigigas
snow point temple
catch one near snow-point city or evolve sneasel
You can't, you can only get ice punch in platinum but a move tutor near snow point city.
Go to snow point city and take a ride on the ferry to an island and if you`ve seen all the Pokemon in sinnoh go to sandgem town and talk to proffeser rowan