You can clone using gts. I'm not going to write how to, but there got to be another question on how to.
Darkrai.
nope
You cannot.
jus fly over
You can't.
You cannot clone Pokemon and items on diamond and pearl and platinum, but you can in emerald!
use ultra balls
You can't unless you migrate by using the pal park...
Trade it using the GTS.
get Pokemon coliseum(Gamecube) and transfer it to leafgreen or fire red and transter using pal park
You can't without cheating. Sorry
No.