It has always been level 1 for every Pokemon Platinum game. Similarly, Pokemon SoulSilver and HeartGold has a location called Sinjoh Ruins, which contains Giratina, Dialga, and Palkia at level 1.++
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why does everyone ask this he just is regigigas was supposed to be asleep for thousands of years, so his power went down and now he is level one.
You cannot get Regigigas in Pokémon SoulSilver, you will have to trade it from Diamond, Pearl or Platinum.
get a GBA to get it
use the explorer kit and dig afte a rare bone when you find the bone sell it and you got money use the money to buy potion and..........regigigas. Regigigas is behind the wood doll of croagunk in the safari zone town. Just talk to the doll. Ps: you need a net ball. IT IS TRUE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :D
you need event regigigas