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Trade from Sapphire/Emerald.
Yes, it is
chaeat
yes
You can find Latios on Pokemon Emerald, Ruby, and SoulSilver.
You have to lock it up on the pokedex.
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there is no BEST way to find him, everything is completely random.
Latios can be traded to Colosseum from Ruby, or Emerald.
after beating league champion in woods and water.
No, you can only get Latias in Sapphire and Emerald and Latios in Ruby and Emerald.
Legendary pokemon you can find in emerald are (without cheats & events) Rayquaza, Groudon, Kyogre, Regirock, Regice, and Registeel.You can get latios OR latias in pokemon emerald too.rayquaza,kyogre,grouden,jirachi,deoxys and i think mew
No legendary Pokemon even latios and latias can have eggs.
in the pokedex
It is possible, but you can't catch them both on 1 Pokemon game. If you have Pokemon Emerald, Ruby and or Sapphire. Then you can get them both. For example: Someone trade Latios and you have Latias, trade an another Pokemon for Latios and you have them both.
Latios is not catchable in Sapphire you must get one from Ruby or Emerald.