Rarest enemies to spawn in a game? (Maybe spoilers?)

Yeah I was going to come in to say phantasy star online also.

Rare enemies were way more valuable in the episode 1 and 2 gamecube and xbox ports, and for blue burst on the PC (you could also do this thing where you telepipe back to town and back to try to get rare enemies to spawn. You will wear the hell out of the gamecube's laser or whatever, but dammit you have to do what you have to do to get them sweet god/battles for you and the homies). In the dreamcast version the drop rate for the most valuable rare items was so jacked up that even if you came across the rare enemies you were more than likely to get a whole lot of nothing, lol.