The only way would be cheating as you can't breed legendary pokemon and you can only meet Regigias at a high level.
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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.
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.++
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
Generally 10.00 but prices do vary based on interest of course...
Regigigas is a Sinnoh pokemon. Not a Hoenn.