latios is leghendary and does not evolve in any game unless its a hack
No, Latias does not evolve
Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
goldenrod
it doesn't evolve.
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 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.
latias dosent evolve cus its a legendary Pokemon
you need your national poke decks to do this look on the map on your pokegear it wil show where latias is