No for some reason the makers of Pokemon this time have made it so you can not battle with older games such as pearl, platinum, dimond, or heart gold or soul silver.
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yes,you can battle with any Pokemon game that's for the ds/dsi/the new 3DS.
No. Pokemon Black and White have new Pokemon that the past games' engines cannot recognize. Even if you battle with Pokemon from previous generations, they might be loaded with moves from the new generation.
you can battle them on routes 224 and 230 in platinum
Unfortunately, in Pokemon Black and White, you cannot interact, (trade, battle etc.), with the other versions, (Platinum, Silver, Emerald etc.). only with Black and White is where you can interact.
No.