first you have to battle the elite four and beat the champion Cynthia, then go to snowpoint and talk to the person infront of the entrance, she or he will say that only the champion can go in, then Cynthia will come and tell the person its ok and that she or he can let you in
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You get them in Snowpoint temple after you get the national dex.
If you have Regice, Regirock, and Registeel.
you have to win the champion and fill your pokedex. (^^)
the Pokemon your looking for is glaceon.oh and you'll need to find a ice crystal in the snowpoint city temple.
Snowpoint temple is in the back of snowpoint city. In order to enter though you need to have beaten the Pokemon league and completed the sinnoh pokedex. by Electchu: how in the world do you get to complete the sinnoh pokedex with out regigigas?