Without spoiling to much, Black Ops is kind of a flashback game with each mission except the last 2 being flashbacks while your character, Alex Mason (voiced by Sam Worthington) is being interrogated by the CIA. The missions include assassinating Fidel Castro, taking part in the Vietnam War, escaping from a Russian Gulag and a flashback from one of the characters - Viktor Reznov (from CoD 5) to WW2. For full details on the story head to the wikipedia page or the COD wiki page.
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You don't need them for the storyline, you get them so your pokemon can hold them and raise their stats.
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.
The storyline is a series of major shine sprites in the game, for example the first tutorial
You cant do storyline on 2p but if you go to two player there is stuff you can do there
There is no campaign for multiplayer. There is multiplayer which has no storyline, there is special ops where you can do co-op to do either a kind of campaign with a storyline with a friend or do survival mode to survive as many times as possible, or there is campaign mode, which is a single-player storyline.