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Regigigas is a Sinnoh pokemon. Not a Hoenn.
Regigigas is a pure Normal-type Pokemon.
You cannot get Regigigas in Pokémon SoulSilver, you will have to trade it from Diamond, Pearl or Platinum.
From what I have heard, Regigigas is a Hoenn pokemon. You will have to trade it from Platnium. Sorry!
Let's do this by base stats to avoid the problem of determining a moveset. I am taking Regigigas' ability Slow Start into account. HP: Even, both have 100. Attack: Dialga has 120; Regigigas has 55 (after Slow Start; 160 normally.) Defense: Dialga has 120; Regigigas has 110. Special Attack: Dialga has 150; Regigigas has 80. Special Defense: Regigigas has 110; Dialga has 100. Speed: Dialga has 90; Regigigas has approximately 35-45 (after Slow Start; 100 normally.) I didn't bother to calculate Regigigas' speed exactly because it's fairly obvious that Dialga is faster. With 4 stats higher and 1 stat tied with Regigigas, Dialga is clearly better - and Regigigas' 10 point special defense difference isn't likely to have any effect.