NOTE This doesn't include special cards earned in Scenario Mode.
Get Tons of Points (All Star Baseball 2004) 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 two outs at the bottom of the ninth, walk the next four 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.
More All Star Baseball 2004 Links for cheat codes:
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