unless you got the enigma stone during the wifi event, there is no way to get latias through regular game play.
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No, neither Latias nor Latios are breedable.
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.
In Pokemon SoulSilver, only Latios is available. To get a Latias, you need an Enigma Stone, which is an event item. You can also trade with someone, use a cheat, use an action replay, etc. Hope I helped :)
yes you can, i was lucky enough to run into one on route 1 in Kanto while i was searching for Latias.