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
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You can't. Pokemon Emerald is just like Sapphire and ruby.
You get a diploma in each, in emerald you can get a johto starter from prof birch and that's it.
Pokemon 152 is chikorita, unfortuntly to obtain one other then from heartgold/soulsilver, Is to beat Pokemon Emerald, all Pokemon cuaght, and then you go to prof. Birch and he'll give u the choice of the 3 jhoto starters
He doesnt appear in Hoenn as far as I am aware. (The only Main Generation games which he doesnt)
After beating the Elite Four, go to a Pokemon Center and Trade a Charizard from Fire Red. you can get a Typhlosion by collecting 200 types of Pokemon then going to prof. birch :)