You have been asked to fight Cerberus with just your Alliance friends so only pick a team with Kaiden/Ashley and James. You can even do it solo if you wish.
This challenge is not difficult if you use the same tactics as in previous challenges. Make good use of any tech powers and the match soon becomes a formality.
If you manage to get a Gold Token in any of those matches, use it to unlock Super Elites at your earliest convenience. After the fight, your Reputation will increase by 5.