Yes. By playing any of the four games (Yooyuball, Make Some Noise, Slushie Slinger or Shootout Showdown), you'll be able to earn Neopoints while simultaneously helping your team and storing Prize Shop points for later. The only exception is during the tournament's practice days; on these days, you'll continue to earn Neopoints. Your performance on these days will not count toward your team's performance, however and Prize Shop points will not get added.