when you defeat the Pokemon league and get your national pokedex.
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
in the temple in snow point
snow point temple. two rare Pokemon
you go to the snow point temple with the other regias they awaken reggias who wich was asleep
Regigigas
you can't catch regice in Pokemon diamond, however, with the use of all the regi's traded over you can take them to the temple in snow point city and awaken regigigas
Well you need GBA games the have regigias's brothers regice, registeel, and regirock. Then you transfer them to diamond. Then you take them in your party Pokemon to snow point temple to regigias and you have to capture him. Note:You can't go into the snow point temple unless, you defeat the elite four.
snow point temple
12th January snow point city
Skill.
beat the elite four!
you have to of beat the snow point gym leader you have to of beat the snow point gym leader
in snow point city next to the rocks