Lava Zone.
in the volcano zone
type in a password and go to the lava zone. to find this password and more go to pokeparkwii.com
After catching both Kyogre and Groundon, you come with them in your team and it'll be there. Beware, you have to trade with HG to get Groundon.
Talk to buneary in the meadow zone.After you play chase with her,then lotad will come to play.
You have to get the National Pokedex and go past the battle tower and on your way there you will find a cave with Groundon in it.
Not there
you find groundon in the embedded tower near the safari zone but you have to get the red orb from mr. Pokemon (blue orb for kyogroe in heartgold)!
The guy is at Whether Institute.
it is already out, i have even finished the game!!
its out now :D
In 2/27/12
Beach zone