You would need to have 2 DS systems handy for this.
You would set both up, go to the top of the Pokemon Center in both, enter the Union Room (middle counter) and walk the trainers up to each other, hit the "TRADE" option, and then trade your Pokemon Diamond Pokemon for your Platinum Pokemon. Just use Pokemon that you'll never use if you want to keep your Platinum Pokemon too.
Hope this helps :)
You trade Magmar from Pokemon pearl,diamond,or platinum to ether Pokemon pearl,diamond,or platinum.
You get a togepi egg in Pokemon Platinum, not Diamond.
Yes they can because platinum was an extension of diamond and is in the same region, Sinnoh.
No, they removed Lavender Town in Pokemon Diamond, Pearl, and Platinum.
you can not get it from Pokemon platinum you can trade in to diamond or pearl
Yes but it does not involve the special features that are offered by the platinum version
Michael does not exist in pokemon diamond,pearl or platinum
no
yes
It means Diamond, Pearl and Platinum.
its only in pokemon platinum
Cynthia the Pokemon Champion has a Milotic in Pokemon Diamond, Pokemon Pearl and Pokemon Platinum.