Yes, it is possible to trade items in Pokemon Pearl but, this is only allowed if you trade the item when it's attached to a Pokemon. If you are trading with a friend and don't want him to have your Pokemon just trade back.
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Of course, how else would you get sizor and steelix. just give the Pokemon an item and trade!
No. Just like in Pokemon Pearl with the Pal Park you can only trade from Pokemon pearl to black, not back
Sorry, but you can't. You can trade from LeafGreen to Pearl, but not back.
In a way, yes. You can give items to your Pokemon and trade them.
You cannot "trade" pokemon between Pokemon FireRed and Pokemon Pearl. Instead, pokemon from Pokemon FireRed Version can be transferred to Pokemon Pearl via Pal Park.