...or is someone willing to give me one for free?
It is impossible without a glitch or cheating device. There used to be a Nintendo event where they gave out an Arceus, but it is now outdated.
There used to be an event, but now, Arceus is impossible to obtain without the use of a glitch or cheating device.
You Don't
you can not get regirock in soul silver but in platinum you can in a special event.
event!
By cheating
its event only
The Pokemon League
Action Replay... But cheating is for the weak.
any time
No
Arceus? By Event only.