I know this has been done before, but I just couldn't resist. :XD:
The Good = Twilight Sparkle
The Bad = Trixie
The Ugly = Rarity (sorry rare…)
This probably makes more sense if you've seen the MLP episode "Boast Busters" and the western "the good, the bad and the ugly", but even then it doesn't make much sense. X3 `