You have to see every Pokemon in the sinnoh region.
you have to complete the first pokedex
The complete Pokedex can be found on http://www.pokemon.marriland.com.
There is only one legitimate way to complete the Sinnoh Pokedex. To complete the Sinnoh Pokedex you must trade for the missing Pokemon with Pokemon Diamond, Pearl or Platinum.
complete the sinnoh pokedex
start again
you hav to complete the sinnoh pokedex!
It is a Chatot in the Sinnoh Pokedex and an Exeggcute in the National Pokedex. If you have an Action Replay, you can get the cheat code that has 100% complete Pokedex and it will fill your whole Pokedex. Hope I helped!!!
Emerald.
From what i know you complete Pokemon diamond and pearl by getting all the gym badges, beating the elite four and completing the pokedex. But im not sure if you have to catch all the Pokemon.
that would be me
in his lab in sadgem town
You don't get all the pokemon.Just the data