You can't catch it anyway, you can trade it from another Ruby Sapphire or Emerald game.
Latias and all other hoenn Pokemon are unable to be captured in both leafgreen and firered to get them you must trade between ruby, sapphire and emerald.
you cant. at least in leaf green
The only possible way to obtain Latias in Fire Red/Leaf Green, is to trade from Ruby/Saphire/Emerald
You can find Latias in Soulsilver throughout the Kanto region.
You can't... The only way to get Latios or Latias is to trade... Sorry bud :(
latias
Latias is not available in SoulSilver
You can find latias on every route in hoenn.
migrate it
Piplup does not exist in Pokemon LeafGreen or FireRed.
No, you cannot find cyndaquil in LeafGreen.
you should go to gamestop