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.
latias or latios will show up on your pokegear map just like raikou and entei
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 find Latias while you're roaming Kanto in Heart Gold, and in Soul Silver you can get a Latias in Pewter City while you have the Enigma Stone.
Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
Once you have the National PokeDex, Steven will tell you that Latias is roaming Kanto. Now you just have to find it.
just go somewhere,anywhere
Latias is a Dragon and Psychic type pokemon.
only latias is available
You need to defeat the champion again to make latias reappear.
In pokemon Heartgold
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.