Can you trade your ruby/sapphire pokemon to Emerald Without going to fire red or leaf green. Do you have to trade through fire red Leaf green. So Ruby or sapphire can trade to Emerald?
These are all Hoenn Pokemon, so yes, you can trade them from R/S to Emerald before you beat the Emerald game.
To trade from FR/LG to Emerald, or to trade any non-Hoenn Pokemon, you'll need the National Dex, which you'll get after you beat the Elite Four. Once you pick which Lati@s you want in your game, go to Birch's lab and he'll give it to you.