How do you catch arcus?

you need to use an action replay or go to a Pokemon event to get azure flute. once you have the azure flute you go to the top of mount corenet and play the flute. arceus will appear at level 80 so be...

you cant but but if you can wait till august 8 2011 it will bet is Pokemon shade of darkness version and in Pokemon crystal light version

to contract a disease

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You have to get a Gamstop Celebi to activate the Zorua event.