PokéBase - Pokémon Q&A
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You need the National Dex, which you get after beating the elite four. Then talk to the woman outside and the snowpoint gym leader will come and let you in.

Also to make Regigigas wake up, you need to migrate the three "regis" - Regirock, Registeel, Regice - from Ruby/Sapphire/Emerald.

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