You cant do it without these things.
you cant
As of now, there is no way of catching Arceus without cheating or hacking.
You can only get it by Action replay,Mystery gift or Wi-fi conettion
it's impossible without mystery gift action replay or gameshark
You would have to go to an Event where they had Mystery gifts. But the events are past, so you cannot get one without an Action Replay now.
you need an action replay
Using an action replay.
You cant you have to buy action replay
=Its not possible but getting aceus is without action replay=
Yes..BUT its considered cheating using an action replay
by action replay
you can not besides friends