I'm trying to complete every National Dex in one game per gen (Blue and Crystal 3DS VC already done), in legit versions of the games, that means no emulator.

So, Emerald is next and I'll need to inject event mons like mythicals in my GBA physical cartridge. I know I have to buy a Flashcard so I can download the events, but I never did this before and need your tips.

What Flashcard should I buy? What's the best? All my cartridges are Spanish versions, does this matter somehow?