you have to cheat or you cant
Arceus is not possible to find in Pokemon Ruby. It was released in 2007 with Pokemon Diamond and Pearl
Arceus is a sinnoh pokemon. unless you have a gameshark and a code, you cant get it in ruby.
if you want to catch arceus you can,t but if you get Pokemon arceus version avalible on eBay and a connecting cable you can trade arceus with yourself so you can have it on ruby.
You won't be able to and if you could Ruby would mess up because that's not a Pokemon in ruby.
Sorry to tell you but u cant get them in ruby because they werent even thought of wen ruby was made
you can find arceus in the hoenn region.
Where ever you find normal Arceus. :p
You need arceus event
You can not FIND arceus in a city. You must find it through the evnt for Pearl Daimond or Platinum.
its not on a route, to find arceus you need action replay and go to mount coronet.Get to the end and you'll find steps.Keep going until you find arceus at the end of them.
You dont find the actual arceus you only find a statue of him on the 100th floor of destiny tower
aftewr you get your national pokedex you will get a place where you can catch it only of you have the bayleaf on Ruby.