yeah, if u have 2 ds's
I'm guessing that you mean migration. Anyways, if that's the case, then migration is when you send a pokemon from a previous game to a newer game. By doing so, you won't be able to send the sent pokemon back to the previous game. ie. you have pokemon emerald and you send Latias over to platinum. You won't be able to send latias back to emerald because of changes that could've been done like teaching Latias moves that didn't exist in emerald.
you can't trade your Pokemon back because the game thinks that you will send one of the newer Pokemon to your heart gold or soul silver
you can only send Pokemon from soul silver to black with the pokishifter
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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, late in the game, the option for Poketransfer, which requires 2 NDS systems. The transfer is permanent, and one way; you can send pokemon to Black/White/2 from any of the 5 previous NDS pokemon games in this way.
obviously. that's what the pokewalker is made for.
You can't, it's not possible
I don't think so, but I don't think you can send the ones in the Pokewalker to the new game, either.
You can only send Deoxys, Shaymin, Manaphy and Heatran, that are found in quests given by Wi-Fi.
no you can not, it doesn't work that work that when you delete the file that has the certain Pokemon you put in the pokewalker you wouldn't be able to send to the new game. you'd have to reset the pokewalker and delete all data in it. (including the Pokemon)
you have to send it over from an older pokemon game