RetroGaming

I think part of the Pokemon situation is that there is still a strong competitive scene for at least some older generations on legitimate hardware, for gathering Pokémon if not for battling them (you need a gen 3 cart to get a legitimate Jirachi off of Pokemon Colosseum/XD, for example), so there is still high demand from the competitive community for many of those older games. Some pokemon can still be very difficult to get legit versions of without the older gen games due to them being only limited releases otherwise.