@Everyone-well,here are a few of the features:
One image reveals that three of the legendary Pokémon of Hoenn — Groudon, Kyogre and Rayquaza — will also be available in the games. Upon beating the Elite Four of Johto, Kyogre and Groudon can be caught in HeartGold and SoulSilver, respectively. Their location is currently unknown. Once both Pokémon are brought together in either HeartGold or SoulSilver, Rayquaza can be encountered.[/quote
AND:
The fourth image shows Arceus and Cynthia together in an unknown place in HeartGold and SoulSilver where there are three symbols on the floor. One of the characters in the image is saying, "They were given the right to choose one life out of three" with no additional context. There are rumors going around Japanese forums which state that if the Arceus obtained from official events is traded to HeartGold or SoulSilver, a level 1 Dialga, Palkia or Giratina can be caught.
You will be getting a lot of oppurtunities to catch legendaries in HG/SS.
