What is the easiest Black Hole badge to earn?

I am wondering witch one to get is the easiest to get. I really want one because I just got to 50k energy points and want way more to evolve my avatar even more. I chose a Black Hole badge because they look cool and they give a ton of energy points! Please tell me if you know because I really want a cooler avatar and something to do in my extra free time if I will have any.