No, I've never played any of the Japanese Pokemon games. I didn't know anyone from Japan (who had the game, could get me the copy, could translate, etc.) when the Japanese Red and Green came out, didn't know how to order games from Japan, and didn't know Japanese, so there wasn't much incentive. I've seen videos and screenshots of Green since then, and have read a fair amount about it, but I've never played it myself. I did have an RBY guide that included pictures of some of the Green sprites for some reason, though.