Boost. Have at least 3, if not 4 people. (There's no difference between 3 and 4, just the number of people achieving, therefore efficiency). Go to a party match. Have 2 people on the winning team and whoever is on the losing team have a team bid of 13. This will result in -200 points and the end of the game as the default match is to 200 points. Rinse and repeat, quick and easy 25 games and then switch, making sure that you have 2 people on the winning team.