Giovanni-Make money off of pokemon.
Archie/Maxie- Expand the sea/land depending on your game.
Cyrus-Wants to gt rid of the universe to create a new one.
Ghetsis-Wants to free pokemon from civilization and rule the world.
Lysandre-Wants to destroy the world and make a new, like Cyrus.
Guzma-Make money off of Pokemon.
Honestly, Team Plasma wins it for me. Ghetsis and the teams goal was different from others and I think that freeing pokemon from civilization isnt exactly evil. Of course, he manipulated N and his daughters, crowning N a "king" and betrayed his team in gen 5's sequel, and of course, the most controversial, trying to kill a 10 year old girl/boy. But hey, its better than making money off of pokemon.