How do you trade with someone on pokemon diamond?

Question

plz anyone

Answer 1

it is done with wii so if you don't have tha you can't trade...

but you can migrate pokemon from: firered leaf green, emerals, sapphire and ruby in pal park. you can get there after you have seen all the pokemon in sinnoh and have obtained the national dex.

Answer 2

you can go to the pokemon center down stairs is wi fi up stairs is connected . hope this helped