Yeah from my experience a lot of the rarer black variants (Robodemons, Raid 2020, Metal Fighter and Silent Assault) I have only seen from the micro genius boxes from Europe. I opened up a sealed Robodemons and Raid 2020 that I got from a guy in Italy with the micro genius stickers to make sure they had the black cartridges and they were. Interestingly enough they had black and white manuals inside as well. I have not seen a micro genius box that did not have a black cartridge in it. As far as the other games (Baby Boomer, Moon Ranger, Menace Beach, Challenge of the Dragon, Master Chu, King Neptune and a couple others I cant think of, I've seen all of those out of the US without micro genius boxes. Also what speedy says is true too, there are some of the sealed games from europe that have french and other translations but the ones ive opened and seen did not have black cartridge variants.
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Looking for Black cartridge Color Dreams games, last 3 I need: Metal Fighter, Moon Ranger, Baby Boomer. Please contact me if you have any of these!