Go to the copycats house after you have restored power to the power plant. She says she has lost her cleifairy doll and asks you to find it. It is in the Pokemon fan club in Vermillion City. after you get it and walk out a man will tell you that a Pokemon from hoenn has travelled to kanto. This Pokemon is Latias and will be roaming kanto.
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.
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.
In pokemon Heartgold
Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
just go somewhere,anywhere
Once you have the National PokeDex, Steven will tell you that Latias is roaming Kanto. Now you just have to find it.
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.
Latias is a Dragon and Psychic type pokemon.
goldenrod
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.
u can only get it on soul silver, the same way u get latias.
The trick is to save your master ball.