You can't get Gen4 pokemon in Gen3 game.
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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.
There is no cheat to obtain Kyogre in Pokemon Ruby. To obtain Kyogre and Pokemon Ruby, one must trade with a trainer that has obtained Kyogre in Pokemon Sapphire or Emerald.
v1.1 is Cheat Enable One
u cant caught the regis in Pokemon pearl if you want the regis migrate it from sapphire,ruby or emerald
You have to trade it from a different game or you need action replay for the cheat code. You can trade if from Pokemon Emerald, Sapphire, and Ruby to Pokemon migration center.