i am so sorry i just erased your whole answer i can give more detail
1st.you have to have a pal pad with other people signed on there
2nd.you head to the Pokemon center and go to the lady on the 2nd floor by the global terminal the closest to it and wall la
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Trade from white and if you have white trade from black for tornadous
Pokemon White, and other copies of Pokemon Black.
You have to trade a starter to another Pokemon white or black game then trade the Pokemon back.
Celebi isn't available in Pokemon Black and White. You have to transfer it into Pokemon Black and White or trade for one.
Yes you can but you can't trade from black to pearl or white to diamond because the games are not compatible with each other because the Pokemon in black and white will come up as ? in the pokedex's of the other games. But you just can't trade to pearl from black or white sorry. However you can trade between black and white using infrared connection. (the other games don't have infrared that's why the game cancels the trade between pearl and black or diamond to black).