There are some in-game trades that allow you to trade. Also, if you have wi-fi, you could use the Global Trading Center.
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You can't, you will have to get one of your friends to trade it with you. Or someone else you know.
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.
you can not trade a snorlax in Pokemon pearl or dimand but there are ways of getting it you can trade with friends or use action replay
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.