u/Street-Deer-6661

I have recently played a few of the Pokémon games for the first time and am trying to get all my favorite Pokémon in the same game. I played Sapphire on the DS with the GBA game but unfortunately realized at the end it must be a fake because I don’t see the migrate option on the heart gold main menu. Does anyone have suggestions on how I can get around this without an authentic game?