i would say yes its defence is realy good if u have sapphire emerald or ruby u can get registeel in lilycove but the cave door must be sommoned to open
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There are four Regi pokemon. They are Regirock, Regice, Registeel, and Regigigas.
First you need the special event Regigigas in order to activate Regirock, Regice and Registeel. All 3 of them are in different caves scattered through the Sinnoh region in Platinum. Regirock is in a cave within Route 228, Regice is in a cave in Mt. Coronet which is near the exit to Route 216 and Registeel is in a cave within Iron Island.
You have to catch Regirock, Regiice, and Registeel. Then go to the Snowpoint Temple. (North of Snowpoint City) Regigigas will be at the end. You walk up to it and battle it. It will be at level 70.
The legendary Pokemon in Pokemon sapphire are groudon, rayquaza, Kyogre, Regice, Regirock and registeel EDIT: No you cannot unlock/get Groudon, Rayquaza, or the Regi's.
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.