NOTE
This doesn't include special cards earned in Scenario Mode.

Get Tons of Points
Start a two-player game and proceed to strike out every batter on each side until the bottom of the ninth inning.
When you've got 2 outs at the bottom of the ninth, walk the next 4 hitters to earn enough points to buy 100 card packs, which should get you almost every card. If not, repeat and get yourself more card packs.

Easy Hits
When your up at bat, press square to get power. Right when the pitcher throws the ball, press pause. Look at where the ball is. Resume back to the game and move the target to the ball. You will get good hits.

A+ TEAM
NEGRO ALL STARS