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?
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all you have to do is get a national poke'dex by copleating your sinnoh one
then go visit the temple and the guard will not let u in but the gym leader will come and let u in
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.
at snowpoint city temple national dex needed u can also find a jynx if you are lucky enough