The original Pokemon games had a nice feeling to them. They were the classics that started it all; there's just one problem I have with them. I would have to use my Gameboy SP to play them again, with a backlight, since (I think all three versions of) Nintendo DS's don't support GB/GBC games, only GBA and DS.
But anyway, all I remember from Red (my favorite of the three, and I can't remember why) is that I wasted my Master Ball on a Jigglypuff because it was one of the six Pokemon I didn't have at the time, and that I ended up being able to catch Moltres with a Great Ball.