In the embedded tower to find it you need the blue orb which is given by Mr Pokemon AFTER OBTAINING THE NATIONAL DEX AND THE KANTO STARTERS BY PROFESSOR OAK
go and speak him
Trade from HeartGold or migrate it.
in pokemon heartgold after you beat red and get your 2 starters you go to mr. pokemon and he'll give you the blue orb to kyorgre
You can find kyogre on heartgold after you get the blue orb from mr.Pokemon on route 30. you can get the blue orb by either beating Pokemon trainer red the first time or giving him the red scale you found some where in the story.
Trade frome Sapphire
go see profess er oak in pallet town. he will want to talk to you. Try to get the red orb from one of you friends if they have Pokemon soulsilver. You need to get kyogre and then you can get another rare Pokemon.
Kyorgre isn't in pokemon ranger guardian signs. However, there is entei, rakou, suicune, lugia, mewtwo, ho-oh, and celebi.
in tge cave just out of lilycove city
ride the robo kyorgre in gateon port
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
where is the pokemon transfer lab in heartgold