u cant get in it pal park and DONT TRADE IT OR UR SCREWD IN THIS GAME u need to have the national dex and beaten da poke league then go to snowpoint temple and at first u cant go in but candiece lets ya inthen go ur fnden them
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u could cheat or use the wifi trade center
You can't... without Action Replay. I do not know a legit way to get Regice (along with Registeel and Regirock) The only Regi I know how to get legit is Regigigas, which needs Regirock Regice and Registeel. If you know a legit way to get Regirock Regice and Registeel, edit this answer. actually you can. all you have to do is send Pokemon from ruby, or Sapphire to dimond or pearl or platinum. then trade it to soul silver.
this site should answer all your questions: Aerisdies.com
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you have to have all the three that make it up: regice, regirock and registeel, then add them to your party and head to the basement of the snowpoint temple and interact with the regigigas statue