you can't
Nintendo events!!! google it
you have to download them at a Nintendo event
ar codes or Nintendo events
No, it might be given out by Nintendo events or something
no im a representitive of Nintendo and we never redo events on the Pokemon games but if you want to find out when they are search Pokemon platinum UK events and go to serribi.net
celebi is onlyobtainable throw Nintendo events
Official Nintendo events are events in which you can obtain rare or legendary Pokémon, they're usually held multiple times a year. You need a wi-fi connection to partecipate, without you can't.
no theres only platinum events sorry.
You can only get Arceus through Nintendo events if you don't want to use cheating devices.
Sadly, It Isn't Possible. if there were Nintendo events more often that would make all our lives alot more easy
Action Replay codes.
You can catch Arceus in Platinum with the Azure Flute which is obtainable through Official Nintendo Events but otherwise, you will not usually be able to get an Arceus from someone.