The Atlantic Division consists of the following teams:
Toronto Raptors
Boston Celtics
Philadelphia 76ers
Brooklyn Nets
New York Knicks
I got this by creating a new lineup that I named Atlantic Team. I then placed any players I had into their respective positions. I did not have any one from the 76ers, and Knicks (empty SF and PF) so I purchased them via auction. Placed into their positions in the lineup, and won by playing the very first challenge vs the Lakers(already had completed). Popped at the end of the game after I won.