in a island to get there you need mistery gift
There is no deoxys
mag pakito ka
Get a Deoxys in Pokemon Emerald, Ruby, Sapphire, Firered, or Leafgreen using the Mystery Gift, and migrate it to your Diamond Version.
Deoxys was first introduced in the 3rd gen, so you can't get in in Yellow Version.
Well you can´t in-game. You have to go to a special nintendo event in which they'll give you one or you have to use a cheat device such as the gameshark.
firered and leafgreen version
use that gameshark user.
The emerald doesn't exist in firered.
No, Pokemon FireRed version is for GBA.
You have to trade from Firered or Leafgreen version.
No
in mt.moon