No, you can't. You can capture it only in Ruby and Emerald and then migrate it.
No
groudon is in pal park in the mountain area
You will battle Groudon for your chance to capture it in Pokemon Omega Ruby after gaining more power.
groudon
in the Pokemon center
No.
With a Pokeball Nah but seriously you net to migrate them from a saphire/ruby/emerald cartdrige. you cannot use a dsi as there is not DS port. i am assuming you are playing Diamond, Pearl or Platinum.
No. -.- You can capture it without defeating them.
you cant but you cant but if u trade it from heart gold to platinum then you have a groudon
Yes but it will be hard to capture.
You will need Action Replay for cheats.
you cant ,but u can trade for 1