Latias is a Dragon and Psychic type pokemon.
Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
latios and latias appear in random patches of grass and areas of water after you catch Rayquaza or make him faint.(after saving the world in Sootopolis.)
goldenrod
only latias is available
You need to defeat the champion again to make latias reappear.
In pokemon Heartgold
You can't get Latios in HeartGold. You can get Latias, to get her, talk to the copycat in Saffron and find her lost doll in Vermillion city at the fan club and Steven will be out there when you come out. He will talk about Latias for a minute and Latias will be in Kanto just walking around like Raikou.
You can't get to the Hoenn region in HeartGold or SoulSilver. However, Latias can be caught in HeartGold, which is a legendary from Hoenn.
you need your national poke decks to do this look on the map on your pokegear it wil show where latias is
latias or latios will show up on your pokegear map just like raikou and entei
it roams kanto after you get it on the marking map
If you mean Latias, it didn't feature in Pokemon Gold, but it did feature in HeartGold. You can find it roaming Kanto on HeartGold by using your PokeGear, there is only One Latias in the game.