After obtaining the National Dex and seeing Steven while leaving the Pokemon Fan Club in Vermilion City, Latios will be roaming around Kanto, similar to how Entei and Raikou roam around Johto
Latios is a non-breedable Pokemon,so no.
You can find Latios on Pokemon Emerald, Ruby, and SoulSilver.
Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
latios is a roaming Pokemon so it will appear in random places in kanto
No, neither Latias nor Latios are breedable.
You get emerald and choose blue, have sapphire, have soulsilver.
Entie,Rioku,and Suicune, also Latios in the kanto region
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).
the fastest water type in silver is kingdra
You can get latios after you meet Steven, and latias through the enigma stone event.
The legendaries on Soulsilver are as follows: Entei, Raikou, Suicune, Lugia, Ho-oh, Groudon, Latios, Rayquaza, Mewtwo, Moltres, Articuno, Zapdos. These are the legendaries found on Pokémon Soulsilver version. ~CareyPrice31FTW
If you don't have enigma stone, keep it for Latios is my advice