Yes as long as there is another ds nearby you do not have to trade with a person you dont know
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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.
It is possible you are trying to trade Pokemon from the hoenn region (ruby, sapphire, emerald) onto firered/ leafgreen. This is not possible until have done a certain thing. The other possibility is that you need at least 2 Pokemon to trade.
No unfortunately you have to trade some Pokemon for them to evolve so you need some one with pokemon crystal, sliver, or gold to trade with.
No. But you can trade from FireRed, LeafGreen, Sapphire, Ruby or Emerald to Diamond, Pearl or Platinum
yes but you must defeat her in a rematch and talk to her twice & stealix will be at the same level of the Pokemon you trade.