Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
The cool legendaries you can get in Soulsilver/heartgold are the following: Lugia, Ho-oh, Raikou, Entei, Suicune, Articuno, Moltres, Zapdos, Mewtwo, Latias, Latios (Latios in Soulsilver & Latias in Heartgold), Kyogre, Groudon, Rayquaza (Kyogre in Heartgold, Groudon in Soulsilver & Rayquaza if you have both).
In the pewter city museum. to get his attantion you must bring walking latias ( heartgold) or latios ( soulsilver ) with a soul dew from a mystery gift. then he will take you to saffron city. he will talk to you for a while. then he will go back to pewter then show you latios ( heartgold ) or latias ( soulsilver ) outside of the museum. then after you defeat or catch one of eon Pokemon that's the last of him.
HeartGold-Latias SoulSilver-Latios After speaking to the people in the fan club in Vermillion City, Steven is stading outside the fanclub. Speak with him and he tells you that a Hoenn legendary is now roaming in Kanto.
No, neither Latias nor Latios are breedable.
you can't, but you can catch latios in ss and latias in hg hg(Heartgold) ss(Soulsilver)
Steven Stone is in Heartgold and Soulsilver because he tells you that Latias or Latios (depending on your version) is flying around and able to be caught.
Latias is the main Pokemon in Heart Gold. Latios is the main Pokemon in Soul Silver. The only way to get the other Pokemon is to have the Enigma Stone. The distribution event is over so you have to ask a friend if they have it to give to you.
Hmmm sounds familiar I think it is an event or has to do with Latios/Latias? Idk I'm probably wrong.
Once you ask the Copycat in Saffron City to get her Clefairy Doll back Talk to the man inside The Pokemon Fan Club.Then he will give you the Clefairy Doll go outside.Then Steven Stone will talk to you he will say that Latias(HeartGold)or Latios(SoulSilver).Finally Latias or Latios will roam Johto or Kanto.But sorry,you can't get Latios without Cheating,Hacking or Trading. :(
After you get the lost doll from the fan club at vermilion city, Steven talks to you about latias(heartgold) latios(soulsilver). After that, latios/latias will start roaming the kanto region. You can see where it is in your pokegear
you'll have 2 get the event (hg and ss only) of the latios and latias or trade them from heartgold or soulsilver. it is found i soulsilver really.
Latias is a legendary pokemon, so you cant get an egg from either latias or latios, even though they have genders.