I think the only way to do it is the Union Room. The one that doesn't require friend codes, or wi-fi connection. :) Hope this helped!
No, but you can send Pokemon from Pokemon Pearl to Pokemon Black. In-depth details: Remember that if you trade from Pokemon Pearl to Pokemon Black, you must have the Japanese version of Pearl since it's quite region locked.
You can't. Black and White are fifth generation games and Diamond and Pearl are fourth generation. However, once the National Dex has been obtained, you can transfer your Gen IV Pokemon to Gen V games.
No. Just like in Pokemon Pearl with the Pal Park you can only trade from Pokemon pearl to black, not back
NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!
no
you get the manaphy egg in Pokemon rangers and send it into Pokemon diamond or pearl
trade them
Yes you can.
it's impossible to send black and white Pokemon over to previous Pokemon games for ds. you can only send Pokemon to black and white.
There is no way to send regice regirock and registeel from ranger to pearl. the only Pokemon that can be transferred from ranger to pearl is the manaphy egg.
you can't trade Pokemon, but you can transfer pearl Pokemon to gen v (your Pokemon black) using the Pokemon transfer available after you beat the main storyline. it is on the route next to black city. hope i helped!
No