Pokémon Emerald, has an added effect that previous games didnt have. When you fill your Hoenn Dex, you go to Prof. Birch and he gives you an option of 3 New Pokémon, all exotic. You can only get 1 so pick Wisely

First Is Cyndaquil, the Fire Echidna Pokémon

Next is Totodile, the Water Crocodile Pokémon

First Is Chikorita, The Grass Dinosaur Pokémon

Remember you can only pick one so pick wisely