First of all, spelling FAIL! It's Arceus (pronounced ar-kee-us) , not arceaus. Second, to catch Arceus, you need to either cheat (what I did) or get it from an event.
You must get arceaus flute to catch it.
no p.s i know this because i beat the whole game and i did not have a mission to catch arceaus
Its a pokemon, NOT ANIMAL!
No you will have to trade.
never dude
no. only events
not until a event is released
No. Platnum and Black and White are two different gens. When they made/release Pokemon Platnum, they had no ideo about Reshiram and Zekrom. They focused more on Dialga, Palkia, Arceaus, ext.
You can use the shiny Pokemon action replay code and them catch arceaus
The arceaus event
heatran,moltres,infernape,magmortar,arceaus
Arceaus (but you can only get it through events)