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.
It is possible to trade Pokemon platinum to diamond and pearl, but you cannot trade to any other game.
no but you can trade Pokemon holding the items.
yes i fink it is possible
That trade is not possible. Soulsilver cannot recognize Pokemon from newer versions.
no. that isn't possible
Using the WIFI link in Pokemon, it is possible to trade Pokemon with people around the world.
No.
get as much Pokemon as possible, then trade to get the others.
yes
Yes, it is possible to trade your UK Pokemon from Diamond into the Japanese Pokemon Black version. However, you need to beat the whole game in Pokemon Black & White to be able to trade Pokemon from the other generations.
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.
get as much Pokemon as possible, then trade to get the others.