You battle people or look for them in the wild
You need to see all Pokemon in sinnoh
there are 150 kinds of Pokemon that you can see and/or obtain. Unless you have friend trade you Pokemon that you can only get in pearl to you, you'll never obtain them all. In Pokemon diamond and pearl all you have to do is see the Pokemon and you get its data unlike the older versions where you have to obtain them.
check marriland.com's pokedex it shows you all the Pokemon if you type the in the Pokemon you want to see.
you see all Pokemon then click the pokedex then see the Pokemon you want then click area on the pokedex hoped i didnt helped
you have to see all of them. i had trouble finding a wormadam holding trainer.
You have to see all the Pokemon in the Sinnoh Pokedex.
By Trading.
check your national pokedex check serebii.net :)
Battle Every Single Character in the Game to meet all the Pokemon in Pokemon Pearl.
You can get the Pokemon in Sinnoh. If you go to Pokemon.com, you can see them.
on Pokemon pearl you only see 1
Get an Action Replay and select 100% Pokemon on pokedex.