Can Pokemon Diamond trade with Pokemon Pearl?
You can't transfer diamond and pearl Pokemon to emerald, but you can trade Pokemon emerald to diamond and pearl. To do this, first see all 150 Pokemon, then go to professer Rowan, get national dex. Professer Oak will come along too, and he'll tell you about pal park, the thing which you need to trade old Pokemon from old games to diamond or pearl
if you mean can you get Pokemon from pearl and diamond and trade them to ruby so you can get diamond and pearl Pokemon on ruby. then no you can not. but you can migrate ruby Pokemon. you put the Pokemon in ruby that you want to put on diamond or pearl in the PC. save it turn off. then go to diamond and migrate them. must be in ds at the same time. pal…