No. They are completely different games (/black are V gen whereas platinum is IV gen). However, Pokemon platinum does share many similarities with Pokemon diamond and peal.
There has always been a Pokemon League in each main Pokemon game, so yes.
You could buy pokemon black and white
Pokemon Black and White are the next Pokemon games in the main series, starting the fifth generation.
After you finished the main story of the game, yes you can trade. A Pokemon transfer is on Route 15.
the way they are showing the game Pokemon black and white in the us i am almost positive that it is already out in the main/sanfoard area
you hold l+r trgger on the main screen
The 'next' Pokemon game was Pokemon Mystery Dungeon: Magnagate and the Infinite Labyrinth. The next main-series game will be Pokemon X and Pokemon Y, the first 6th generation games.
There is but you have to beat the game to bring them in the game
If you are refering to the Pokemon Dream World, then you can go to the website: pokemon-gl.com . Here, you will be able to register by using your Pokemon Black/Black 2 or Pokemon White/White 2 game. By going on your main menu in the game, and by adding it to your registered account in the PGL, you game should be synced.
By dog Pokemon I assume you mean the Legendary Beasts (Entei, Raikou, Suicune). You can them get into your Pokemon White game by using the Transfer Lab, but you can only use the Lab if you've beaten the main story.
the main Pokemon is zekrom
To transfer your Pokemon from diamond to white you first have to beat the game in Pokemon white. After that you have to go to the Pokemon transfer lab, go up the steps and speak to the scientist. Then you need another DS that has your Diamond Pokemon in it, go to DS download play on the main screen and you can choose six Pokemon to transfer from your storage. 1) You must have already beat the Pokemon White Game 2) You need 2 DS's 3)The Pokemon that you want to send to Pokemon White must be in your storage in the Pokemon center in Diamond.