Arceus cannot be found during normal gameplay. You need to get it from an event
Nope. It has to be a event Arceus.
Use action replay
No, unfortunately, you can't. Unless you use a game shark or action replay. To get Arceus, you have to do a Pokemon special event such as the 12th movie Arceus event. There are rumors that there will eventually be other Arceus event as well.
You don't need a special Arceus for the Sinjoh Ruins event in HeartGold/SoulSilver, you can use a regular one that you caught in the Hall of Origins as well.
You can either use an action replay or you could have attended the arceus event in 2010.
Arceus cannot be found through normal game play. You must get an Arceus from the Arceus event that took place quite some time ago in order to have it in your game.
no you can use any as long it is a special event one
You cannot actually obtain Arceus through normal gameplay on any games. Either you cheat or get it through an event.
LugiaHo-OhSuicuneEnteiRaikouArticunoZapdosMoltresMewtwoKyogreRayquazaArceus(event)Giratina(arceus event)Dialga(arceus event)Palkia(arceus eventLatias
no
You use it to get a baby Palkia, Dialga, or Giratina in an event in HeartGold/SoulSilver