Do you mean trade from Diamond to Platinum?? If so, you need two ds's and a copy of each, sorry bad answer.
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you would have to transfer a snover from pokemon diamond pearl or platinum
There is no way of getting a Charizard in Pokemon Diamond, Pearl or Platinum. You can transfer a Charmander from Fire Red to your copy of Pokemon Diamond, Pearl or Platinum. A Charmander, Charmillion and Charizard can all be found in Pokemon Heartgold and Soulsilver as a wild pokemon.
probably not i would think that the pokewalker would only work on heart gold and soul silver ( i have 2 ds`s and platinum/diamond and i will get heart gold)
To get your emerald Pokemon to platinum you transfer them in pal park.
To transfer a Pokemon to Pokemon soul silver or heart gold you have to transfer it to platinum, diamond, or pearl first. Then you are going to need another DS. Put platinum, diamond, or pearl inside one DS(depending on which one you put the Pokemon in), and SS or HG in the other. You can trade regularly between those generations of games. Hope this helped.