I own a EFA Linker for the GBA and I curretly have pokemon emerald on it. I was wondering if it will link up to a store bought copy of Pokemon Diamond/Pearl.
You sould be able to untick the menu option so it doesn't put a menu on the cart. I've had original games linked up before with my flash EFA flashcart and had 3 or 4 games on it with a menu and never had problems.