The first version of Ghetsis from Black/White 1. I like how his entire team, including his relationship with N, was just an elaborate plot to gain power for himself.
In Black/White 2 he took more of an average insane villain role.
This is always my answer too, for the exact same reason. Team Plasma was always shady operating under the premise of good, but Ghetsis was even willing to manipulate his adopted son for his own benefits. Pure evil, sure, but a well crafted plan on his part that almost got him his ultimate goal.