Here are the steps I've made:
- Pokemon Heart Gold is completed, all 16 badges, have the National dex, reached Pal Park in Fuschia city, and had the guy explaining to me how to use it.
- Pokemon Emerald is also completed, the Elite 4 is beaten, National dex is obtained, and battle frontier is unlocked.
- I insert both into my DS Lite, the opening screen shows both.
- I enter HG and in the start menu, the Migrate From option won't appear. I've scrolled down.
I can play Emerald just fine on the DS, as well as HG. Other games of the 3rd generation give the same symptoms (although, I haven't completed those).
What might cause this phenomenon? What have I missed?