You eat all the magic burritos and say pie.
You either get it by an EVENT or you can TRADE or get an ACTION REPLAY.
first of all it's arcius and you'll need the azure flute.play it at the spear pillar and some staircase comes.go up the staircase and arcius is there.
It is Arceus. First get the azure flute from the event and go to spear pillar
there will be an event where you can catch arceus coming soon.
just use the Pokemon modifier... if you don't have that, just look on google for it
platinum get arceus this year from a Nintendo event, get someone to trade you one from a platinum game
get an arcius fult then go to where you foun palkia/dialga the use the flute arcius will then be there
Rhetus arcius was created in 1763.
Yes you can get Arceus if you have a Pokemon platinum,diamond,or pearl and you have giratina dialga and palkia trade them to your Soulsilver and then a mountain will appear somewhere and then Arceus will be in there
U go to the trickmaster and defeat him then he'll give u Arcius
Just catch all the Pokemon first then arcius will come out so you needed to go around to find him