You have to trade it from D/P/Pt.
use mystery gift and go 2 spear pillar
By getting a azure flute and going to spear pillar. Or trading.
Its about 500 feet above the spear piller you need Nintendo event
You find him in Mt corentet after you have defeated the elite 4 20 times.
You can't get Arceus in the game. The only legitimate way is to migrate it from other games or you can get one from events.
Yes you can with two ways.First way is to trade from Pokemon pearl diamond and platinum.Second way is throught an event of Pokemon archeus
I'm suprised that your game didn't reset like mine... but I'd re-use the action replay, turn OFF the modifier code, then play the game. (You might want to save if that works)
the only way u can see it is through a Nintendo event or action replay either way u get to capture it
in SS, there are Lugia, HO-OH, latios(may be latias not sure, but one of hem), mewtwo, the three dogs, the three birds, Kyogre(i think its kyogre, groudon in HG), possibly raquaza, if you have Groudon from HG; Archeus, Giratina Dialga and Palkia(Giratina Dialga and Palkia require you to have Archeus with you when you go to ruins of alph and go to archeologists' house and you may only chose one of them. you will also only get them at lv. 1).
u have to go to your national dex and choose his number if u have action replay and then u throw away however many masterballs then run into grass holding L and he will pop up hope this helpedc
Talk to the mystery gift guy in celestic town. he will give you an azure flute. then go to the spear pillar. it will say," your names azure flute is making a sound! blow into azure flute?" Say, yes and a stairway will appear go up and arceus is on the little platform. Go forward and you will see it. ONLY TRY IF YOU ARE PREPARED. It will take a really long time. Buy at least 50 ultra balls. and maybe 5 quick balls. then try to catch it.