You need to beat the Pokemon league, the battle frontier, and the stark mountain mission
Trust me it takes FOREVER and there isn't anything inside it except for a regigagus statue and ice
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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?
just go to the youjizz
To get to the snowpoint city temple you have to beat the Pokemon legue champion first you also need to have regirock, regice and registeel but to have these Pokemon you will have to trade from ruby, emerald or sapphire
Just go the way you got in to get out.
You get them in Snowpoint temple after you get the national dex.