You can only Trade directly with Pokemon Black. You can transfer Pokemon from the older games after you have beat the main storyline and obtained the national pokedex.
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The only way to get palkia in Pokemon white is to trade from other games
You can trade between those two games, but if you want Pokemon in the previous games, its like migrating. You can't migrate Pokemon from your Gameboy games! Plus, you have to defeat the game before you can trade over with different games.
Yes you can but you can't trade from black to pearl or white to diamond because the games are not compatible with each other because the Pokemon in black and white will come up as ? in the pokedex's of the other games. But you just can't trade to pearl from black or white sorry. However you can trade between black and white using infrared connection. (the other games don't have infrared that's why the game cancels the trade between pearl and black or diamond to black).
You'll need to transfer it from the older Pokemon DS games into the Pokemon Transfer Lab or trade for it.
You have to trade a starter to another Pokemon white or black game then trade the Pokemon back.