Never tried a challenge. I think I'd rather play Pokemon games normally. Yesterday I used a original Gameboy that I have just for fun and at least the save file of my Pokemon Blue is still intact. Too bad my Gold one got deleted with all these 250 different Pokemon, more than 250 hours of gameplay, all the shinys and Pokemon I took so much time to train to Lvl 100...
I've totally forgotten that there was a handheld that lets you adjust color contrast (even though it doesn't really matter since the Gameboy can only display 4 different colors xD)
Never had that happen. Though Gen II I did find the most random shinies. Don't have any of them anymore though except my Shiny Elekid from the mystery egg. Didn't even know it was shiny until I transferred it onto Pokemon Stadium II.
Part of it you answered by yourself. You have to trade a shiny into RBY and then find a wild Ditto. Let it transform into your shiny and then catch it with a masterball (don't know if other balls work; haven't tried that in a while). As soon as you transfer this Ditto into GSC you should get a shiny Ditto. Since Ditto is compatible with most of the Pokemon if you use it for breeding every egg you receive has that 1/64 chance of containing a shiny. Don't really know how this tricks called but since you get a shiny Ditto as a result I might as well call it shiny Ditto trick xD
Don't try that with a Mew, though, since RBY recognizes every wild Pokemon which used transform as Ditto, so if you catch a Mew which used transform you only get a Ditto out of it.