The same way you complete the pokedex in the rest of the Pokemon games. You can either do it by catching and trading every single pokemon in the game or you can cheat and use and action replay
by seeing every Pokemon in platinum. usually made by compleating the game.
try evolving Pokemon and taking more battles. taking the battles at the 7 star restaurant is good as the trainers change every day.
trading Pokemon is very good.
play the game through with a chickoirta or a totodile
Once you complete the Elite Four in Johto, Professor Elm gives you an S.S. ticket to Kanto. When you beat all the gyms there Professor Oak will tell the officer guarding Mt.Silver that you can pass. At the top of Mount Silver there will be a trainer, his name is Red. He is the character from Pokemon Leaf Green and Fire Red. Red is very powerful so I suggest to train before the fight. After you defeat Red you're free to do whatever :D
the only way to complete Pokemon pearl is to catch every Pokemon on both pokedexs and get to level 100 and unlock everything so keep trying to get as far as i have.
you need to see all of the Pokemon in sinnoh
You defeat all Gym Leaders (Kanto and Johto) and get a Hoenn Starter. It's actually still not going to be over, however-there is no limit to Pokemon Games.
Last time I checked, only in Emerald did you have to capture every Pokemon for the PokeDex to be complete.
you find all the Pokemon
you have to beat the Pokemon champion and later on in the game you will complete it
You have to travel around Sinnoh to complete the Pokedex.
YOU NEED TO FIGHT ALL POKEMON AND YOU WILL COMPLETE THE POKEDEX. AND THAT WILL HELP YOU TO GET THE NATIONAL POKEDEX BY TALKIN TO PROFESSOR OAK.
see all the Pokemon on the shino pokedex then talk to pofesor rowan
You have to catch 151 pokemon to complete the pokedex.
you need to find 210 Pokemon to complete the pokedex
you have to complete the first pokedex
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 Pokedex
first it is the pokedex and look on pokemon.com they have a pokedex page
First complete the sinnoh pokedex, 210 Pokemon
Last time I checked, only in Emerald did you have to capture every Pokemon for the PokeDex to be complete.
You have to complete the Sinnoh pokedex before haveing the national pokedex.
you find all the Pokemon
you fill up the national dex and complete turn back cave