back in the late 00’s there was (maybe still is, who knows) an online service called “gamefly” where you could rent games. At the time the DS pokemon games would allow you to plug in a pokemon GBA cart and copy the pokemon from the GBA to your DS. So I would constantly rent GBA Pokemon games in hopes of finding something good on them to copy to my DS Pokemon game. I had it all scheduled out and everything. You could also wondertrade hacked pokemon or like really good pokemon online. I don’t remember exactly HOW you did it but I do remembering doing it.