In order to catch either of these uncatchable Pokemon you first must beat the Elite Four then go back to your house and watch the T.V. The T.Vwill say what color was the Pokemon. Red = Latias an d Blue = Latios. You may notice every time you go to look for either of these Pokemon they will run away from you.
You can only get latias in sapphire get latios from ruby or emerald.
You can find Latios on Pokemon Emerald, Ruby, and SoulSilver.
You have to lock it up on the pokedex.
answer... you need to trade from ruby or emerald!
No
go to route 118 enough to get latios or go near by pacifilog town
You have to find it somewhere in the Hoenn and use a masterball.
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You can find Latias and latios anywhere in Hoenn. You just have to get lucky.
Latios can be found anywhere the easiest routes where its spotted most is the west of mauville city and the right.
there is no BEST way to find him, everything is completely random.
after beating league champion in woods and water.