There's no possible way to trade back. Once you've transferred from Emerald, there's no going back. It's in Diamond forever, or at least until you delete your game.
no
You can't get them in Pokemon diamond, you must trade from Pokemon emerald.
I'm sorry to say but no. Only migrate to diamond if your willing to no longer have it on emerald. If you do migrate it to diamond and want it back, you must use a cheat, trade or restart the game.
there is no way sorry
You pick it as your starter pokemon. Otherwise you will have to trade or cheat.
you have to trade it from a different game, trying ctahing it on Pokemon emerald and migrate it to Pokemon diamond
You can't unless you trade it from diamond
Trade to emerald and migrate them
You can neither trade from FireRed/LeafGreen to Emerald or using Cheat device.. After all Lapras not wild in Pokemon emerald..
no, i think you have to trade it from the hoenn region(pokemon emerald) to get it in your diamond game
Not unless you use a cheat or trade.
YUP