Unlike Ruby & Sapphire, Emerald let you pick which Lati roams around Hoenn (by letting you select either "red" or "blue" after watching a report on TV).
So: For those of you who've played Emerald, which did you choose as your roaming legendary - Latias or Latios?
I've played through Emerald a few times, but I chose Latias during my first playthrough. This was before I got Sapphire, so I didn't have a Latias at the time and I'd already caught Latios on Ruby.