in Fallarbor town go left until you see the Pokemon center go down and you'll see a Pokemart go left until you see a house with two smokestack looking things and go inside you see two people ones a girl the other Professor Cozmo
torchic,treeko,mudkip
You can't. Pokemon Emerald is just like Sapphire and ruby.
Prof. Cosmo isn't in Emerald.
save prof. birch
in route 101
in my opinion emerald is way better than ruby. that is because there is battle frontier in emerald and in emerald we get a jotho starter pokemon from prof. birch after beating hoen dex!
Prof Cozmo is the person who lost the meteroite he lives in fallarbor town please note he is in a house not a lab.
You can find Cozmo, within meteor falls, then in his house in fallharbour (or however it is spelt) - the one in the extreme north anyway. ~Lestat
In emerald you can fly (or walk) to fallabor town and there you will find prof. cozmo's house and he will trade you a TM for your metorite
Prof cozmo in fallarbor town will take the meteorite he gives you a TM.
In emerald if you complete the pokedex you can get Chikorita, Cyndaquil and Totodoile from prof birch.
You get a diploma in each, in emerald you can get a johto starter from prof birch and that's it.